
| Key Word | PostgreSQL | SQL:2023 | SQL:2016 | SQL-92 |
| --- | --- | --- | --- | --- |
| `A` |   | non-reserved | non-reserved |   |
| `ABORT` | non-reserved |   |   |   |
| `ABS` |   | reserved | reserved |   |
| `ABSENT` | non-reserved | reserved | reserved |   |
| `ABSOLUTE` | non-reserved | non-reserved | non-reserved | reserved |
| `ACCESS` | non-reserved |   |   |   |
| `ACCORDING` |   | non-reserved | non-reserved |   |
| `ACOS` |   | reserved | reserved |   |
| `ACTION` | non-reserved | non-reserved | non-reserved | reserved |
| `ADA` |   | non-reserved | non-reserved | non-reserved |
| `ADD` | non-reserved | non-reserved | non-reserved | reserved |
| `ADMIN` | non-reserved | non-reserved | non-reserved |   |
| `AFTER` | non-reserved | non-reserved | non-reserved |   |
| `AGGREGATE` | non-reserved |   |   |   |
| `ALL` | reserved | reserved | reserved | reserved |
| `ALLOCATE` |   | reserved | reserved | reserved |
| `ALSO` | non-reserved |   |   |   |
| `ALTER` | non-reserved | reserved | reserved | reserved |
| `ALWAYS` | non-reserved | non-reserved | non-reserved |   |
| `ANALYSE` | reserved |   |   |   |
| `ANALYZE` | reserved |   |   |   |
| `AND` | reserved | reserved | reserved | reserved |
| `ANY` | reserved | reserved | reserved | reserved |
| `ANY_VALUE` |   | reserved |   |   |
| `ARE` |   | reserved | reserved | reserved |
| `ARRAY` | reserved, requires `AS` | reserved | reserved |   |
| `ARRAY_AGG` |   | reserved | reserved |   |
| `ARRAY_​MAX_​CARDINALITY` |   | reserved | reserved |   |
| `AS` | reserved, requires `AS` | reserved | reserved | reserved |
| `ASC` | reserved | non-reserved | non-reserved | reserved |
| `ASENSITIVE` | non-reserved | reserved | reserved |   |
| `ASIN` |   | reserved | reserved |   |
| `ASSERTION` | non-reserved | non-reserved | non-reserved | reserved |
| `ASSIGNMENT` | non-reserved | non-reserved | non-reserved |   |
| `ASYMMETRIC` | reserved | reserved | reserved |   |
| `AT` | non-reserved | reserved | reserved | reserved |
| `ATAN` |   | reserved | reserved |   |
| `ATOMIC` | non-reserved | reserved | reserved |   |
| `ATTACH` | non-reserved |   |   |   |
| `ATTRIBUTE` | non-reserved | non-reserved | non-reserved |   |
| `ATTRIBUTES` |   | non-reserved | non-reserved |   |
| `AUTHORIZATION` | reserved (can be function or type) | reserved | reserved | reserved |
| `AVG` |   | reserved | reserved | reserved |
| `BACKWARD` | non-reserved |   |   |   |
| `BASE64` |   | non-reserved | non-reserved |   |
| `BEFORE` | non-reserved | non-reserved | non-reserved |   |
| `BEGIN` | non-reserved | reserved | reserved | reserved |
| `BEGIN_FRAME` |   | reserved | reserved |   |
| `BEGIN_PARTITION` |   | reserved | reserved |   |
| `BERNOULLI` |   | non-reserved | non-reserved |   |
| `BETWEEN` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `BIGINT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `BINARY` | reserved (can be function or type) | reserved | reserved |   |
| `BIT` | non-reserved (cannot be function or type) |   |   | reserved |
| `BIT_LENGTH` |   |   |   | reserved |
| `BLOB` |   | reserved | reserved |   |
| `BLOCKED` |   | non-reserved | non-reserved |   |
| `BOM` |   | non-reserved | non-reserved |   |
| `BOOLEAN` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `BOTH` | reserved | reserved | reserved | reserved |
| `BREADTH` | non-reserved | non-reserved | non-reserved |   |
| `BTRIM` |   | reserved |   |   |
| `BY` | non-reserved | reserved | reserved | reserved |
| `C` |   | non-reserved | non-reserved | non-reserved |
| `CACHE` | non-reserved |   |   |   |
| `CALL` | non-reserved | reserved | reserved |   |
| `CALLED` | non-reserved | reserved | reserved |   |
| `CARDINALITY` |   | reserved | reserved |   |
| `CASCADE` | non-reserved | non-reserved | non-reserved | reserved |
| `CASCADED` | non-reserved | reserved | reserved | reserved |
| `CASE` | reserved | reserved | reserved | reserved |
| `CAST` | reserved | reserved | reserved | reserved |
| `CATALOG` | non-reserved | non-reserved | non-reserved | reserved |
| `CATALOG_NAME` |   | non-reserved | non-reserved | non-reserved |
| `CEIL` |   | reserved | reserved |   |
| `CEILING` |   | reserved | reserved |   |
| `CHAIN` | non-reserved | non-reserved | non-reserved |   |
| `CHAINING` |   | non-reserved | non-reserved |   |
| `CHAR` | non-reserved (cannot be function or type), requires `AS` | reserved | reserved | reserved |
| `CHARACTER` | non-reserved (cannot be function or type), requires `AS` | reserved | reserved | reserved |
| `CHARACTERISTICS` | non-reserved | non-reserved | non-reserved |   |
| `CHARACTERS` |   | non-reserved | non-reserved |   |
| `CHARACTER_LENGTH` |   | reserved | reserved | reserved |
| `CHARACTER_​SET_​CATALOG` |   | non-reserved | non-reserved | non-reserved |
| `CHARACTER_SET_NAME` |   | non-reserved | non-reserved | non-reserved |
| `CHARACTER_SET_SCHEMA` |   | non-reserved | non-reserved | non-reserved |
| `CHAR_LENGTH` |   | reserved | reserved | reserved |
| `CHECK` | reserved | reserved | reserved | reserved |
| `CHECKPOINT` | non-reserved |   |   |   |
| `CLASS` | non-reserved |   |   |   |
| `CLASSIFIER` |   | reserved | reserved |   |
| `CLASS_ORIGIN` |   | non-reserved | non-reserved | non-reserved |
| `CLOB` |   | reserved | reserved |   |
| `CLOSE` | non-reserved | reserved | reserved | reserved |
| `CLUSTER` | non-reserved |   |   |   |
| `COALESCE` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `COBOL` |   | non-reserved | non-reserved | non-reserved |
| `COLLATE` | reserved | reserved | reserved | reserved |
| `COLLATION` | reserved (can be function or type) | non-reserved | non-reserved | reserved |
| `COLLATION_CATALOG` |   | non-reserved | non-reserved | non-reserved |
| `COLLATION_NAME` |   | non-reserved | non-reserved | non-reserved |
| `COLLATION_SCHEMA` |   | non-reserved | non-reserved | non-reserved |
| `COLLECT` |   | reserved | reserved |   |
| `COLUMN` | reserved | reserved | reserved | reserved |
| `COLUMNS` | non-reserved | non-reserved | non-reserved |   |
| `COLUMN_NAME` |   | non-reserved | non-reserved | non-reserved |
| `COMMAND_FUNCTION` |   | non-reserved | non-reserved | non-reserved |
| `COMMAND_​FUNCTION_​CODE` |   | non-reserved | non-reserved |   |
| `COMMENT` | non-reserved |   |   |   |
| `COMMENTS` | non-reserved |   |   |   |
| `COMMIT` | non-reserved | reserved | reserved | reserved |
| `COMMITTED` | non-reserved | non-reserved | non-reserved | non-reserved |
| `COMPRESSION` | non-reserved |   |   |   |
| `CONCURRENTLY` | reserved (can be function or type) |   |   |   |
| `CONDITION` |   | reserved | reserved |   |
| `CONDITIONAL` | non-reserved | non-reserved | non-reserved |   |
| `CONDITION_NUMBER` |   | non-reserved | non-reserved | non-reserved |
| `CONFIGURATION` | non-reserved |   |   |   |
| `CONFLICT` | non-reserved |   |   |   |
| `CONNECT` |   | reserved | reserved | reserved |
| `CONNECTION` | non-reserved | non-reserved | non-reserved | reserved |
| `CONNECTION_NAME` |   | non-reserved | non-reserved | non-reserved |
| `CONSTRAINT` | reserved | reserved | reserved | reserved |
| `CONSTRAINTS` | non-reserved | non-reserved | non-reserved | reserved |
| `CONSTRAINT_CATALOG` |   | non-reserved | non-reserved | non-reserved |
| `CONSTRAINT_NAME` |   | non-reserved | non-reserved | non-reserved |
| `CONSTRAINT_SCHEMA` |   | non-reserved | non-reserved | non-reserved |
| `CONSTRUCTOR` |   | non-reserved | non-reserved |   |
| `CONTAINS` |   | reserved | reserved |   |
| `CONTENT` | non-reserved | non-reserved | non-reserved |   |
| `CONTINUE` | non-reserved | non-reserved | non-reserved | reserved |
| `CONTROL` |   | non-reserved | non-reserved |   |
| `CONVERSION` | non-reserved |   |   |   |
| `CONVERT` |   | reserved | reserved | reserved |
| `COPARTITION` |   | non-reserved |   |   |
| `COPY` | non-reserved | reserved | reserved |   |
| `CORR` |   | reserved | reserved |   |
| `CORRESPONDING` |   | reserved | reserved | reserved |
| `COS` |   | reserved | reserved |   |
| `COSH` |   | reserved | reserved |   |
| `COST` | non-reserved |   |   |   |
| `COUNT` |   | reserved | reserved | reserved |
| `COVAR_POP` |   | reserved | reserved |   |
| `COVAR_SAMP` |   | reserved | reserved |   |
| `CREATE` | reserved, requires `AS` | reserved | reserved | reserved |
| `CROSS` | reserved (can be function or type) | reserved | reserved | reserved |
| `CSV` | non-reserved |   |   |   |
| `CUBE` | non-reserved | reserved | reserved |   |
| `CUME_DIST` |   | reserved | reserved |   |
| `CURRENT` | non-reserved | reserved | reserved | reserved |
| `CURRENT_CATALOG` | reserved | reserved | reserved |   |
| `CURRENT_DATE` | reserved | reserved | reserved | reserved |
| `CURRENT_​DEFAULT_​TRANSFORM_​GROUP` |   | reserved | reserved |   |
| `CURRENT_PATH` |   | reserved | reserved |   |
| `CURRENT_ROLE` | reserved | reserved | reserved |   |
| `CURRENT_ROW` |   | reserved | reserved |   |
| `CURRENT_SCHEMA` | reserved (can be function or type) | reserved | reserved |   |
| `CURRENT_TIME` | reserved | reserved | reserved | reserved |
| `CURRENT_TIMESTAMP` | reserved | reserved | reserved | reserved |
| `CURRENT_​TRANSFORM_​GROUP_​FOR_​TYPE` |   | reserved | reserved |   |
| `CURRENT_USER` | reserved | reserved | reserved | reserved |
| `CURSOR` | non-reserved | reserved | reserved | reserved |
| `CURSOR_NAME` |   | non-reserved | non-reserved | non-reserved |
| `CYCLE` | non-reserved | reserved | reserved |   |
| `DATA` | non-reserved | non-reserved | non-reserved | non-reserved |
| `DATABASE` | non-reserved |   |   |   |
| `DATALINK` |   | reserved | reserved |   |
| `DATE` |   | reserved | reserved | reserved |
| `DATETIME_​INTERVAL_​CODE` |   | non-reserved | non-reserved | non-reserved |
| `DATETIME_​INTERVAL_​PRECISION` |   | non-reserved | non-reserved | non-reserved |
| `DAY` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `DB` |   | non-reserved | non-reserved |   |
| `DEALLOCATE` | non-reserved | reserved | reserved | reserved |
| `DEC` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `DECFLOAT` |   | reserved | reserved |   |
| `DECIMAL` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `DECLARE` | non-reserved | reserved | reserved | reserved |
| `DEFAULT` | reserved | reserved | reserved | reserved |
| `DEFAULTS` | non-reserved | non-reserved | non-reserved |   |
| `DEFERRABLE` | reserved | non-reserved | non-reserved | reserved |
| `DEFERRED` | non-reserved | non-reserved | non-reserved | reserved |
| `DEFINE` |   | reserved | reserved |   |
| `DEFINED` |   | non-reserved | non-reserved |   |
| `DEFINER` | non-reserved | non-reserved | non-reserved |   |
| `DEGREE` |   | non-reserved | non-reserved |   |
| `DELETE` | non-reserved | reserved | reserved | reserved |
| `DELIMITER` | non-reserved |   |   |   |
| `DELIMITERS` | non-reserved |   |   |   |
| `DENSE_RANK` |   | reserved | reserved |   |
| `DEPENDS` | non-reserved |   |   |   |
| `DEPTH` | non-reserved | non-reserved | non-reserved |   |
| `DEREF` |   | reserved | reserved |   |
| `DERIVED` |   | non-reserved | non-reserved |   |
| `DESC` | reserved | non-reserved | non-reserved | reserved |
| `DESCRIBE` |   | reserved | reserved | reserved |
| `DESCRIPTOR` |   | non-reserved | non-reserved | reserved |
| `DETACH` | non-reserved |   |   |   |
| `DETERMINISTIC` |   | reserved | reserved |   |
| `DIAGNOSTICS` |   | non-reserved | non-reserved | reserved |
| `DICTIONARY` | non-reserved |   |   |   |
| `DISABLE` | non-reserved |   |   |   |
| `DISCARD` | non-reserved |   |   |   |
| `DISCONNECT` |   | reserved | reserved | reserved |
| `DISPATCH` |   | non-reserved | non-reserved |   |
| `DISTINCT` | reserved | reserved | reserved | reserved |
| `DLNEWCOPY` |   | reserved | reserved |   |
| `DLPREVIOUSCOPY` |   | reserved | reserved |   |
| `DLURLCOMPLETE` |   | reserved | reserved |   |
| `DLURLCOMPLETEONLY` |   | reserved | reserved |   |
| `DLURLCOMPLETEWRITE` |   | reserved | reserved |   |
| `DLURLPATH` |   | reserved | reserved |   |
| `DLURLPATHONLY` |   | reserved | reserved |   |
| `DLURLPATHWRITE` |   | reserved | reserved |   |
| `DLURLSCHEME` |   | reserved | reserved |   |
| `DLURLSERVER` |   | reserved | reserved |   |
| `DLVALUE` |   | reserved | reserved |   |
| `DO` | reserved |   |   |   |
| `DOCUMENT` | non-reserved | non-reserved | non-reserved |   |
| `DOMAIN` | non-reserved | non-reserved | non-reserved | reserved |
| `DOUBLE` | non-reserved | reserved | reserved | reserved |
| `DROP` | non-reserved | reserved | reserved | reserved |
| `DYNAMIC` |   | reserved | reserved |   |
| `DYNAMIC_FUNCTION` |   | non-reserved | non-reserved | non-reserved |
| `DYNAMIC_​FUNCTION_​CODE` |   | non-reserved | non-reserved |   |
| `EACH` | non-reserved | reserved | reserved |   |
| `ELEMENT` |   | reserved | reserved |   |
| `ELSE` | reserved | reserved | reserved | reserved |
| `EMPTY` | non-reserved | reserved | reserved |   |
| `ENABLE` | non-reserved |   |   |   |
| `ENCODING` | non-reserved | non-reserved | non-reserved |   |
| `ENCRYPTED` | non-reserved |   |   |   |
| `END` | reserved | reserved | reserved | reserved |
| `END-EXEC` |   | reserved | reserved | reserved |
| `END_FRAME` |   | reserved | reserved |   |
| `END_PARTITION` |   | reserved | reserved |   |
| `ENFORCED` | non-reserved | non-reserved | non-reserved |   |
| `ENUM` | non-reserved |   |   |   |
| `EQUALS` |   | reserved | reserved |   |
| `ERROR` | non-reserved | non-reserved | non-reserved |   |
| `ESCAPE` | non-reserved | reserved | reserved | reserved |
| `EVENT` | non-reserved |   |   |   |
| `EVERY` |   | reserved | reserved |   |
| `EXCEPT` | reserved, requires `AS` | reserved | reserved | reserved |
| `EXCEPTION` |   |   |   | reserved |
| `EXCLUDE` | non-reserved | non-reserved | non-reserved |   |
| `EXCLUDING` | non-reserved | non-reserved | non-reserved |   |
| `EXCLUSIVE` | non-reserved |   |   |   |
| `EXEC` |   | reserved | reserved | reserved |
| `EXECUTE` | non-reserved | reserved | reserved | reserved |
| `EXISTS` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `EXP` |   | reserved | reserved |   |
| `EXPLAIN` | non-reserved |   |   |   |
| `EXPRESSION` | non-reserved | non-reserved | non-reserved |   |
| `EXTENSION` | non-reserved |   |   |   |
| `EXTERNAL` | non-reserved | reserved | reserved | reserved |
| `EXTRACT` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `FALSE` | reserved | reserved | reserved | reserved |
| `FAMILY` | non-reserved |   |   |   |
| `FETCH` | reserved, requires `AS` | reserved | reserved | reserved |
| `FILE` |   | non-reserved | non-reserved |   |
| `FILTER` | non-reserved, requires `AS` | reserved | reserved |   |
| `FINAL` |   | non-reserved | non-reserved |   |
| `FINALIZE` | non-reserved |   |   |   |
| `FINISH` |   | non-reserved | non-reserved |   |
| `FIRST` | non-reserved | non-reserved | non-reserved | reserved |
| `FIRST_VALUE` |   | reserved | reserved |   |
| `FLAG` |   | non-reserved | non-reserved |   |
| `FLOAT` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `FLOOR` |   | reserved | reserved |   |
| `FOLLOWING` | non-reserved | non-reserved | non-reserved |   |
| `FOR` | reserved, requires `AS` | reserved | reserved | reserved |
| `FORCE` | non-reserved |   |   |   |
| `FOREIGN` | reserved | reserved | reserved | reserved |
| `FORMAT` | non-reserved | non-reserved | non-reserved |   |
| `FORTRAN` |   | non-reserved | non-reserved | non-reserved |
| `FORWARD` | non-reserved |   |   |   |
| `FOUND` |   | non-reserved | non-reserved | reserved |
| `FRAME_ROW` |   | reserved | reserved |   |
| `FREE` |   | reserved | reserved |   |
| `FREEZE` | reserved (can be function or type) |   |   |   |
| `FROM` | reserved, requires `AS` | reserved | reserved | reserved |
| `FS` |   | non-reserved | non-reserved |   |
| `FULFILL` |   | non-reserved | non-reserved |   |
| `FULL` | reserved (can be function or type) | reserved | reserved | reserved |
| `FUNCTION` | non-reserved | reserved | reserved |   |
| `FUNCTIONS` | non-reserved |   |   |   |
| `FUSION` |   | reserved | reserved |   |
| `G` |   | non-reserved | non-reserved |   |
| `GENERAL` |   | non-reserved | non-reserved |   |
| `GENERATED` | non-reserved | non-reserved | non-reserved |   |
| `GET` |   | reserved | reserved | reserved |
| `GLOBAL` | non-reserved | reserved | reserved | reserved |
| `GO` |   | non-reserved | non-reserved | reserved |
| `GOTO` |   | non-reserved | non-reserved | reserved |
| `GRANT` | reserved, requires `AS` | reserved | reserved | reserved |
| `GRANTED` | non-reserved | non-reserved | non-reserved |   |
| `GREATEST` | non-reserved (cannot be function or type) | reserved |   |   |
| `GROUP` | reserved, requires `AS` | reserved | reserved | reserved |
| `GROUPING` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `GROUPS` | non-reserved | reserved | reserved |   |
| `HANDLER` | non-reserved |   |   |   |
| `HAVING` | reserved, requires `AS` | reserved | reserved | reserved |
| `HEADER` | non-reserved |   |   |   |
| `HEX` |   | non-reserved | non-reserved |   |
| `HIERARCHY` |   | non-reserved | non-reserved |   |
| `HOLD` | non-reserved | reserved | reserved |   |
| `HOUR` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `ID` |   | non-reserved | non-reserved |   |
| `IDENTITY` | non-reserved | reserved | reserved | reserved |
| `IF` | non-reserved |   |   |   |
| `IGNORE` |   | non-reserved | non-reserved |   |
| `ILIKE` | reserved (can be function or type) |   |   |   |
| `IMMEDIATE` | non-reserved | non-reserved | non-reserved | reserved |
| `IMMEDIATELY` |   | non-reserved | non-reserved |   |
| `IMMUTABLE` | non-reserved |   |   |   |
| `IMPLEMENTATION` |   | non-reserved | non-reserved |   |
| `IMPLICIT` | non-reserved |   |   |   |
| `IMPORT` | non-reserved | reserved | reserved |   |
| `IN` | reserved | reserved | reserved | reserved |
| `INCLUDE` | non-reserved |   |   |   |
| `INCLUDING` | non-reserved | non-reserved | non-reserved |   |
| `INCREMENT` | non-reserved | non-reserved | non-reserved |   |
| `INDENT` | non-reserved | non-reserved | non-reserved |   |
| `INDEX` | non-reserved |   |   |   |
| `INDEXES` | non-reserved |   |   |   |
| `INDICATOR` |   | reserved | reserved | reserved |
| `INHERIT` | non-reserved |   |   |   |
| `INHERITS` | non-reserved |   |   |   |
| `INITIAL` |   | reserved | reserved |   |
| `INITIALLY` | reserved | non-reserved | non-reserved | reserved |
| `INLINE` | non-reserved |   |   |   |
| `INNER` | reserved (can be function or type) | reserved | reserved | reserved |
| `INOUT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `INPUT` | non-reserved | non-reserved | non-reserved | reserved |
| `INSENSITIVE` | non-reserved | reserved | reserved | reserved |
| `INSERT` | non-reserved | reserved | reserved | reserved |
| `INSTANCE` |   | non-reserved | non-reserved |   |
| `INSTANTIABLE` |   | non-reserved | non-reserved |   |
| `INSTEAD` | non-reserved | non-reserved | non-reserved |   |
| `INT` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `INTEGER` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `INTEGRITY` |   | non-reserved | non-reserved |   |
| `INTERSECT` | reserved, requires `AS` | reserved | reserved | reserved |
| `INTERSECTION` |   | reserved | reserved |   |
| `INTERVAL` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `INTO` | reserved, requires `AS` | reserved | reserved | reserved |
| `INVOKER` | non-reserved | non-reserved | non-reserved |   |
| `IS` | reserved (can be function or type) | reserved | reserved | reserved |
| `ISNULL` | reserved (can be function or type), requires `AS` |   |   |   |
| `ISOLATION` | non-reserved | non-reserved | non-reserved | reserved |
| `JOIN` | reserved (can be function or type) | reserved | reserved | reserved |
| `JSON` | non-reserved (cannot be function or type) | reserved |   |   |
| `JSON_ARRAY` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_ARRAYAGG` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_EXISTS` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_OBJECT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_OBJECTAGG` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_QUERY` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_SCALAR` | non-reserved (cannot be function or type) | reserved |   |   |
| `JSON_SERIALIZE` | non-reserved (cannot be function or type) | reserved |   |   |
| `JSON_TABLE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `JSON_TABLE_PRIMITIVE` |   | reserved | reserved |   |
| `JSON_VALUE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `K` |   | non-reserved | non-reserved |   |
| `KEEP` | non-reserved | non-reserved | non-reserved |   |
| `KEY` | non-reserved | non-reserved | non-reserved | reserved |
| `KEYS` | non-reserved | non-reserved | non-reserved |   |
| `KEY_MEMBER` |   | non-reserved | non-reserved |   |
| `KEY_TYPE` |   | non-reserved | non-reserved |   |
| `LABEL` | non-reserved |   |   |   |
| `LAG` |   | reserved | reserved |   |
| `LANGUAGE` | non-reserved | reserved | reserved | reserved |
| `LARGE` | non-reserved | reserved | reserved |   |
| `LAST` | non-reserved | non-reserved | non-reserved | reserved |
| `LAST_VALUE` |   | reserved | reserved |   |
| `LATERAL` | reserved | reserved | reserved |   |
| `LEAD` |   | reserved | reserved |   |
| `LEADING` | reserved | reserved | reserved | reserved |
| `LEAKPROOF` | non-reserved |   |   |   |
| `LEAST` | non-reserved (cannot be function or type) | reserved |   |   |
| `LEFT` | reserved (can be function or type) | reserved | reserved | reserved |
| `LENGTH` |   | non-reserved | non-reserved | non-reserved |
| `LEVEL` | non-reserved | non-reserved | non-reserved | reserved |
| `LIBRARY` |   | non-reserved | non-reserved |   |
| `LIKE` | reserved (can be function or type) | reserved | reserved | reserved |
| `LIKE_REGEX` |   | reserved | reserved |   |
| `LIMIT` | reserved, requires `AS` | non-reserved | non-reserved |   |
| `LINK` |   | non-reserved | non-reserved |   |
| `LISTAGG` |   | reserved | reserved |   |
| `LISTEN` | non-reserved |   |   |   |
| `LN` |   | reserved | reserved |   |
| `LOAD` | non-reserved |   |   |   |
| `LOCAL` | non-reserved | reserved | reserved | reserved |
| `LOCALTIME` | reserved | reserved | reserved |   |
| `LOCALTIMESTAMP` | reserved | reserved | reserved |   |
| `LOCATION` | non-reserved | non-reserved | non-reserved |   |
| `LOCATOR` |   | non-reserved | non-reserved |   |
| `LOCK` | non-reserved |   |   |   |
| `LOCKED` | non-reserved |   |   |   |
| `LOG` |   | reserved | reserved |   |
| `LOG10` |   | reserved | reserved |   |
| `LOGGED` | non-reserved |   |   |   |
| `LOWER` |   | reserved | reserved | reserved |
| `LPAD` |   | reserved |   |   |
| `LTRIM` |   | reserved |   |   |
| `M` |   | non-reserved | non-reserved |   |
| `MAP` |   | non-reserved | non-reserved |   |
| `MAPPING` | non-reserved | non-reserved | non-reserved |   |
| `MATCH` | non-reserved | reserved | reserved | reserved |
| `MATCHED` | non-reserved | non-reserved | non-reserved |   |
| `MATCHES` |   | reserved | reserved |   |
| `MATCH_NUMBER` |   | reserved | reserved |   |
| `MATCH_RECOGNIZE` |   | reserved | reserved |   |
| `MATERIALIZED` | non-reserved |   |   |   |
| `MAX` |   | reserved | reserved | reserved |
| `MAXVALUE` | non-reserved | non-reserved | non-reserved |   |
| `MEASURES` |   | non-reserved | non-reserved |   |
| `MEMBER` |   | reserved | reserved |   |
| `MERGE` | non-reserved | reserved | reserved |   |
| `MERGE_ACTION` | non-reserved (cannot be function or type) |   |   |   |
| `MESSAGE_LENGTH` |   | non-reserved | non-reserved | non-reserved |
| `MESSAGE_OCTET_LENGTH` |   | non-reserved | non-reserved | non-reserved |
| `MESSAGE_TEXT` |   | non-reserved | non-reserved | non-reserved |
| `METHOD` | non-reserved | reserved | reserved |   |
| `MIN` |   | reserved | reserved | reserved |
| `MINUTE` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `MINVALUE` | non-reserved | non-reserved | non-reserved |   |
| `MOD` |   | reserved | reserved |   |
| `MODE` | non-reserved |   |   |   |
| `MODIFIES` |   | reserved | reserved |   |
| `MODULE` |   | reserved | reserved | reserved |
| `MONTH` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `MORE` |   | non-reserved | non-reserved | non-reserved |
| `MOVE` | non-reserved |   |   |   |
| `MULTISET` |   | reserved | reserved |   |
| `MUMPS` |   | non-reserved | non-reserved | non-reserved |
| `NAME` | non-reserved | non-reserved | non-reserved | non-reserved |
| `NAMES` | non-reserved | non-reserved | non-reserved | reserved |
| `NAMESPACE` |   | non-reserved | non-reserved |   |
| `NATIONAL` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `NATURAL` | reserved (can be function or type) | reserved | reserved | reserved |
| `NCHAR` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `NCLOB` |   | reserved | reserved |   |
| `NESTED` | non-reserved | non-reserved | non-reserved |   |
| `NESTING` |   | non-reserved | non-reserved |   |
| `NEW` | non-reserved | reserved | reserved |   |
| `NEXT` | non-reserved | non-reserved | non-reserved | reserved |
| `NFC` | non-reserved | non-reserved | non-reserved |   |
| `NFD` | non-reserved | non-reserved | non-reserved |   |
| `NFKC` | non-reserved | non-reserved | non-reserved |   |
| `NFKD` | non-reserved | non-reserved | non-reserved |   |
| `NIL` |   | non-reserved | non-reserved |   |
| `NO` | non-reserved | reserved | reserved | reserved |
| `NONE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `NORMALIZE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `NORMALIZED` | non-reserved | non-reserved | non-reserved |   |
| `NOT` | reserved | reserved | reserved | reserved |
| `NOTHING` | non-reserved |   |   |   |
| `NOTIFY` | non-reserved |   |   |   |
| `NOTNULL` | reserved (can be function or type), requires `AS` |   |   |   |
| `NOWAIT` | non-reserved |   |   |   |
| `NTH_VALUE` |   | reserved | reserved |   |
| `NTILE` |   | reserved | reserved |   |
| `NULL` | reserved | reserved | reserved | reserved |
| `NULLABLE` |   | non-reserved | non-reserved | non-reserved |
| `NULLIF` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `NULLS` | non-reserved | non-reserved | non-reserved |   |
| `NULL_ORDERING` |   | non-reserved | non-reserved |   |
| `NUMBER` |   | non-reserved | non-reserved | non-reserved |
| `NUMERIC` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `OBJECT` | non-reserved | non-reserved | non-reserved |   |
| `OBJECTS` | non-reserved |   |   |   |
| `OCCURRENCE` |   | non-reserved | non-reserved |   |
| `OCCURRENCES_REGEX` |   | reserved | reserved |   |
| `OCTETS` |   | non-reserved | non-reserved |   |
| `OCTET_LENGTH` |   | reserved | reserved | reserved |
| `OF` | non-reserved | reserved | reserved | reserved |
| `OFF` | non-reserved | non-reserved | non-reserved |   |
| `OFFSET` | reserved, requires `AS` | reserved | reserved |   |
| `OIDS` | non-reserved |   |   |   |
| `OLD` | non-reserved | reserved | reserved |   |
| `OMIT` | non-reserved | reserved | reserved |   |
| `ON` | reserved, requires `AS` | reserved | reserved | reserved |
| `ONE` |   | reserved | reserved |   |
| `ONLY` | reserved | reserved | reserved | reserved |
| `OPEN` |   | reserved | reserved | reserved |
| `OPERATOR` | non-reserved |   |   |   |
| `OPTION` | non-reserved | non-reserved | non-reserved | reserved |
| `OPTIONS` | non-reserved | non-reserved | non-reserved |   |
| `OR` | reserved | reserved | reserved | reserved |
| `ORDER` | reserved, requires `AS` | reserved | reserved | reserved |
| `ORDERING` |   | non-reserved | non-reserved |   |
| `ORDINALITY` | non-reserved | non-reserved | non-reserved |   |
| `OTHERS` | non-reserved | non-reserved | non-reserved |   |
| `OUT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `OUTER` | reserved (can be function or type) | reserved | reserved | reserved |
| `OUTPUT` |   | non-reserved | non-reserved | reserved |
| `OVER` | non-reserved, requires `AS` | reserved | reserved |   |
| `OVERFLOW` |   | non-reserved | non-reserved |   |
| `OVERLAPS` | reserved (can be function or type), requires `AS` | reserved | reserved | reserved |
| `OVERLAY` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `OVERRIDING` | non-reserved | non-reserved | non-reserved |   |
| `OWNED` | non-reserved |   |   |   |
| `OWNER` | non-reserved |   |   |   |
| `P` |   | non-reserved | non-reserved |   |
| `PAD` |   | non-reserved | non-reserved | reserved |
| `PARALLEL` | non-reserved |   |   |   |
| `PARAMETER` | non-reserved | reserved | reserved |   |
| `PARAMETER_MODE` |   | non-reserved | non-reserved |   |
| `PARAMETER_NAME` |   | non-reserved | non-reserved |   |
| `PARAMETER_​ORDINAL_​POSITION` |   | non-reserved | non-reserved |   |
| `PARAMETER_​SPECIFIC_​CATALOG` |   | non-reserved | non-reserved |   |
| `PARAMETER_​SPECIFIC_​NAME` |   | non-reserved | non-reserved |   |
| `PARAMETER_​SPECIFIC_​SCHEMA` |   | non-reserved | non-reserved |   |
| `PARSER` | non-reserved |   |   |   |
| `PARTIAL` | non-reserved | non-reserved | non-reserved | reserved |
| `PARTITION` | non-reserved | reserved | reserved |   |
| `PASCAL` |   | non-reserved | non-reserved | non-reserved |
| `PASS` |   | non-reserved | non-reserved |   |
| `PASSING` | non-reserved | non-reserved | non-reserved |   |
| `PASSTHROUGH` |   | non-reserved | non-reserved |   |
| `PASSWORD` | non-reserved |   |   |   |
| `PAST` |   | non-reserved | non-reserved |   |
| `PATH` | non-reserved | non-reserved | non-reserved |   |
| `PATTERN` |   | reserved | reserved |   |
| `PER` |   | reserved | reserved |   |
| `PERCENT` |   | reserved | reserved |   |
| `PERCENTILE_CONT` |   | reserved | reserved |   |
| `PERCENTILE_DISC` |   | reserved | reserved |   |
| `PERCENT_RANK` |   | reserved | reserved |   |
| `PERIOD` | non-reserved | reserved | reserved |   |
| `PERMISSION` |   | non-reserved | non-reserved |   |
| `PERMUTE` |   | non-reserved | non-reserved |   |
| `PIPE` |   | non-reserved | non-reserved |   |
| `PLACING` | reserved | non-reserved | non-reserved |   |
| `PLAN` | non-reserved | non-reserved | non-reserved |   |
| `PLANS` | non-reserved |   |   |   |
| `PLI` |   | non-reserved | non-reserved | non-reserved |
| `POLICY` | non-reserved |   |   |   |
| `PORTION` |   | reserved | reserved |   |
| `POSITION` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `POSITION_REGEX` |   | reserved | reserved |   |
| `POWER` |   | reserved | reserved |   |
| `PRECEDES` |   | reserved | reserved |   |
| `PRECEDING` | non-reserved | non-reserved | non-reserved |   |
| `PRECISION` | non-reserved (cannot be function or type), requires `AS` | reserved | reserved | reserved |
| `PREPARE` | non-reserved | reserved | reserved | reserved |
| `PREPARED` | non-reserved |   |   |   |
| `PRESERVE` | non-reserved | non-reserved | non-reserved | reserved |
| `PREV` |   | non-reserved | non-reserved |   |
| `PRIMARY` | reserved | reserved | reserved | reserved |
| `PRIOR` | non-reserved | non-reserved | non-reserved | reserved |
| `PRIVATE` |   | non-reserved | non-reserved |   |
| `PRIVILEGES` | non-reserved | non-reserved | non-reserved | reserved |
| `PROCEDURAL` | non-reserved |   |   |   |
| `PROCEDURE` | non-reserved | reserved | reserved | reserved |
| `PROCEDURES` | non-reserved |   |   |   |
| `PROGRAM` | non-reserved |   |   |   |
| `PRUNE` |   | non-reserved | non-reserved |   |
| `PTF` |   | reserved | reserved |   |
| `PUBLIC` |   | non-reserved | non-reserved | reserved |
| `PUBLICATION` | non-reserved |   |   |   |
| `QUOTE` | non-reserved |   |   |   |
| `QUOTES` | non-reserved | non-reserved | non-reserved |   |
| `RANGE` | non-reserved | reserved | reserved |   |
| `RANK` |   | reserved | reserved |   |
| `READ` | non-reserved | non-reserved | non-reserved | reserved |
| `READS` |   | reserved | reserved |   |
| `REAL` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `REASSIGN` | non-reserved |   |   |   |
| `RECOVERY` |   | non-reserved | non-reserved |   |
| `RECURSIVE` | non-reserved | reserved | reserved |   |
| `REF` | non-reserved | reserved | reserved |   |
| `REFERENCES` | reserved | reserved | reserved | reserved |
| `REFERENCING` | non-reserved | reserved | reserved |   |
| `REFRESH` | non-reserved |   |   |   |
| `REGR_AVGX` |   | reserved | reserved |   |
| `REGR_AVGY` |   | reserved | reserved |   |
| `REGR_COUNT` |   | reserved | reserved |   |
| `REGR_INTERCEPT` |   | reserved | reserved |   |
| `REGR_R2` |   | reserved | reserved |   |
| `REGR_SLOPE` |   | reserved | reserved |   |
| `REGR_SXX` |   | reserved | reserved |   |
| `REGR_SXY` |   | reserved | reserved |   |
| `REGR_SYY` |   | reserved | reserved |   |
| `REINDEX` | non-reserved |   |   |   |
| `RELATIVE` | non-reserved | non-reserved | non-reserved | reserved |
| `RELEASE` | non-reserved | reserved | reserved |   |
| `RENAME` | non-reserved |   |   |   |
| `REPEATABLE` | non-reserved | non-reserved | non-reserved | non-reserved |
| `REPLACE` | non-reserved |   |   |   |
| `REPLICA` | non-reserved |   |   |   |
| `REQUIRING` |   | non-reserved | non-reserved |   |
| `RESET` | non-reserved |   |   |   |
| `RESPECT` |   | non-reserved | non-reserved |   |
| `RESTART` | non-reserved | non-reserved | non-reserved |   |
| `RESTORE` |   | non-reserved | non-reserved |   |
| `RESTRICT` | non-reserved | non-reserved | non-reserved | reserved |
| `RESULT` |   | reserved | reserved |   |
| `RETURN` | non-reserved | reserved | reserved |   |
| `RETURNED_CARDINALITY` |   | non-reserved | non-reserved |   |
| `RETURNED_LENGTH` |   | non-reserved | non-reserved | non-reserved |
| `RETURNED_​OCTET_​LENGTH` |   | non-reserved | non-reserved | non-reserved |
| `RETURNED_SQLSTATE` |   | non-reserved | non-reserved | non-reserved |
| `RETURNING` | reserved, requires `AS` | non-reserved | non-reserved |   |
| `RETURNS` | non-reserved | reserved | reserved |   |
| `REVOKE` | non-reserved | reserved | reserved | reserved |
| `RIGHT` | reserved (can be function or type) | reserved | reserved | reserved |
| `ROLE` | non-reserved | non-reserved | non-reserved |   |
| `ROLLBACK` | non-reserved | reserved | reserved | reserved |
| `ROLLUP` | non-reserved | reserved | reserved |   |
| `ROUTINE` | non-reserved | non-reserved | non-reserved |   |
| `ROUTINES` | non-reserved |   |   |   |
| `ROUTINE_CATALOG` |   | non-reserved | non-reserved |   |
| `ROUTINE_NAME` |   | non-reserved | non-reserved |   |
| `ROUTINE_SCHEMA` |   | non-reserved | non-reserved |   |
| `ROW` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `ROWS` | non-reserved | reserved | reserved | reserved |
| `ROW_COUNT` |   | non-reserved | non-reserved | non-reserved |
| `ROW_NUMBER` |   | reserved | reserved |   |
| `RPAD` |   | reserved |   |   |
| `RTRIM` |   | reserved |   |   |
| `RULE` | non-reserved |   |   |   |
| `RUNNING` |   | reserved | reserved |   |
| `SAVEPOINT` | non-reserved | reserved | reserved |   |
| `SCALAR` | non-reserved | non-reserved | non-reserved |   |
| `SCALE` |   | non-reserved | non-reserved | non-reserved |
| `SCHEMA` | non-reserved | non-reserved | non-reserved | reserved |
| `SCHEMAS` | non-reserved |   |   |   |
| `SCHEMA_NAME` |   | non-reserved | non-reserved | non-reserved |
| `SCOPE` |   | reserved | reserved |   |
| `SCOPE_CATALOG` |   | non-reserved | non-reserved |   |
| `SCOPE_NAME` |   | non-reserved | non-reserved |   |
| `SCOPE_SCHEMA` |   | non-reserved | non-reserved |   |
| `SCROLL` | non-reserved | reserved | reserved | reserved |
| `SEARCH` | non-reserved | reserved | reserved |   |
| `SECOND` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `SECTION` |   | non-reserved | non-reserved | reserved |
| `SECURITY` | non-reserved | non-reserved | non-reserved |   |
| `SEEK` |   | reserved | reserved |   |
| `SELECT` | reserved | reserved | reserved | reserved |
| `SELECTIVE` |   | non-reserved | non-reserved |   |
| `SELF` |   | non-reserved | non-reserved |   |
| `SEMANTICS` |   | non-reserved | non-reserved |   |
| `SENSITIVE` |   | reserved | reserved |   |
| `SEQUENCE` | non-reserved | non-reserved | non-reserved |   |
| `SEQUENCES` | non-reserved |   |   |   |
| `SERIALIZABLE` | non-reserved | non-reserved | non-reserved | non-reserved |
| `SERVER` | non-reserved | non-reserved | non-reserved |   |
| `SERVER_NAME` |   | non-reserved | non-reserved | non-reserved |
| `SESSION` | non-reserved | non-reserved | non-reserved | reserved |
| `SESSION_USER` | reserved | reserved | reserved | reserved |
| `SET` | non-reserved | reserved | reserved | reserved |
| `SETOF` | non-reserved (cannot be function or type) |   |   |   |
| `SETS` | non-reserved | non-reserved | non-reserved |   |
| `SHARE` | non-reserved |   |   |   |
| `SHOW` | non-reserved | reserved | reserved |   |
| `SIMILAR` | reserved (can be function or type) | reserved | reserved |   |
| `SIMPLE` | non-reserved | non-reserved | non-reserved |   |
| `SIN` |   | reserved | reserved |   |
| `SINH` |   | reserved | reserved |   |
| `SIZE` |   | non-reserved | non-reserved | reserved |
| `SKIP` | non-reserved | reserved | reserved |   |
| `SMALLINT` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `SNAPSHOT` | non-reserved |   |   |   |
| `SOME` | reserved | reserved | reserved | reserved |
| `SORT_DIRECTION` |   | non-reserved | non-reserved |   |
| `SOURCE` | non-reserved | non-reserved | non-reserved |   |
| `SPACE` |   | non-reserved | non-reserved | reserved |
| `SPECIFIC` |   | reserved | reserved |   |
| `SPECIFICTYPE` |   | reserved | reserved |   |
| `SPECIFIC_NAME` |   | non-reserved | non-reserved |   |
| `SQL` | non-reserved | reserved | reserved | reserved |
| `SQLCODE` |   |   |   | reserved |
| `SQLERROR` |   |   |   | reserved |
| `SQLEXCEPTION` |   | reserved | reserved |   |
| `SQLSTATE` |   | reserved | reserved | reserved |
| `SQLWARNING` |   | reserved | reserved |   |
| `SQRT` |   | reserved | reserved |   |
| `STABLE` | non-reserved |   |   |   |
| `STANDALONE` | non-reserved | non-reserved | non-reserved |   |
| `START` | non-reserved | reserved | reserved |   |
| `STATE` |   | non-reserved | non-reserved |   |
| `STATEMENT` | non-reserved | non-reserved | non-reserved |   |
| `STATIC` |   | reserved | reserved |   |
| `STATISTICS` | non-reserved |   |   |   |
| `STDDEV_POP` |   | reserved | reserved |   |
| `STDDEV_SAMP` |   | reserved | reserved |   |
| `STDIN` | non-reserved |   |   |   |
| `STDOUT` | non-reserved |   |   |   |
| `STORAGE` | non-reserved |   |   |   |
| `STORED` | non-reserved |   |   |   |
| `STRICT` | non-reserved |   |   |   |
| `STRING` | non-reserved | non-reserved | non-reserved |   |
| `STRIP` | non-reserved | non-reserved | non-reserved |   |
| `STRUCTURE` |   | non-reserved | non-reserved |   |
| `STYLE` |   | non-reserved | non-reserved |   |
| `SUBCLASS_ORIGIN` |   | non-reserved | non-reserved | non-reserved |
| `SUBMULTISET` |   | reserved | reserved |   |
| `SUBSCRIPTION` | non-reserved |   |   |   |
| `SUBSET` |   | reserved | reserved |   |
| `SUBSTRING` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `SUBSTRING_REGEX` |   | reserved | reserved |   |
| `SUCCEEDS` |   | reserved | reserved |   |
| `SUM` |   | reserved | reserved | reserved |
| `SUPPORT` | non-reserved |   |   |   |
| `SYMMETRIC` | reserved | reserved | reserved |   |
| `SYSID` | non-reserved |   |   |   |
| `SYSTEM` | non-reserved | reserved | reserved |   |
| `SYSTEM_TIME` |   | reserved | reserved |   |
| `SYSTEM_USER` | reserved | reserved | reserved | reserved |
| `T` |   | non-reserved | non-reserved |   |
| `TABLE` | reserved | reserved | reserved | reserved |
| `TABLES` | non-reserved |   |   |   |
| `TABLESAMPLE` | reserved (can be function or type) | reserved | reserved |   |
| `TABLESPACE` | non-reserved |   |   |   |
| `TABLE_NAME` |   | non-reserved | non-reserved | non-reserved |
| `TAN` |   | reserved | reserved |   |
| `TANH` |   | reserved | reserved |   |
| `TARGET` | non-reserved |   |   |   |
| `TEMP` | non-reserved |   |   |   |
| `TEMPLATE` | non-reserved |   |   |   |
| `TEMPORARY` | non-reserved | non-reserved | non-reserved | reserved |
| `TEXT` | non-reserved |   |   |   |
| `THEN` | reserved | reserved | reserved | reserved |
| `THROUGH` |   | non-reserved | non-reserved |   |
| `TIES` | non-reserved | non-reserved | non-reserved |   |
| `TIME` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `TIMESTAMP` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `TIMEZONE_HOUR` |   | reserved | reserved | reserved |
| `TIMEZONE_MINUTE` |   | reserved | reserved | reserved |
| `TO` | reserved, requires `AS` | reserved | reserved | reserved |
| `TOKEN` |   | non-reserved | non-reserved |   |
| `TOP_LEVEL_COUNT` |   | non-reserved | non-reserved |   |
| `TRAILING` | reserved | reserved | reserved | reserved |
| `TRANSACTION` | non-reserved | non-reserved | non-reserved | reserved |
| `TRANSACTIONS_​COMMITTED` |   | non-reserved | non-reserved |   |
| `TRANSACTIONS_​ROLLED_​BACK` |   | non-reserved | non-reserved |   |
| `TRANSACTION_ACTIVE` |   | non-reserved | non-reserved |   |
| `TRANSFORM` | non-reserved | non-reserved | non-reserved |   |
| `TRANSFORMS` |   | non-reserved | non-reserved |   |
| `TRANSLATE` |   | reserved | reserved | reserved |
| `TRANSLATE_REGEX` |   | reserved | reserved |   |
| `TRANSLATION` |   | reserved | reserved | reserved |
| `TREAT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `TRIGGER` | non-reserved | reserved | reserved |   |
| `TRIGGER_CATALOG` |   | non-reserved | non-reserved |   |
| `TRIGGER_NAME` |   | non-reserved | non-reserved |   |
| `TRIGGER_SCHEMA` |   | non-reserved | non-reserved |   |
| `TRIM` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `TRIM_ARRAY` |   | reserved | reserved |   |
| `TRUE` | reserved | reserved | reserved | reserved |
| `TRUNCATE` | non-reserved | reserved | reserved |   |
| `TRUSTED` | non-reserved |   |   |   |
| `TYPE` | non-reserved | non-reserved | non-reserved | non-reserved |
| `TYPES` | non-reserved |   |   |   |
| `UESCAPE` | non-reserved | reserved | reserved |   |
| `UNBOUNDED` | non-reserved | non-reserved | non-reserved |   |
| `UNCOMMITTED` | non-reserved | non-reserved | non-reserved | non-reserved |
| `UNCONDITIONAL` | non-reserved | non-reserved | non-reserved |   |
| `UNDER` |   | non-reserved | non-reserved |   |
| `UNENCRYPTED` | non-reserved |   |   |   |
| `UNION` | reserved, requires `AS` | reserved | reserved | reserved |
| `UNIQUE` | reserved | reserved | reserved | reserved |
| `UNKNOWN` | non-reserved | reserved | reserved | reserved |
| `UNLINK` |   | non-reserved | non-reserved |   |
| `UNLISTEN` | non-reserved |   |   |   |
| `UNLOGGED` | non-reserved |   |   |   |
| `UNMATCHED` |   | non-reserved | non-reserved |   |
| `UNNAMED` |   | non-reserved | non-reserved | non-reserved |
| `UNNEST` |   | reserved | reserved |   |
| `UNTIL` | non-reserved |   |   |   |
| `UNTYPED` |   | non-reserved | non-reserved |   |
| `UPDATE` | non-reserved | reserved | reserved | reserved |
| `UPPER` |   | reserved | reserved | reserved |
| `URI` |   | non-reserved | non-reserved |   |
| `USAGE` |   | non-reserved | non-reserved | reserved |
| `USER` | reserved | reserved | reserved | reserved |
| `USER_​DEFINED_​TYPE_​CATALOG` |   | non-reserved | non-reserved |   |
| `USER_​DEFINED_​TYPE_​CODE` |   | non-reserved | non-reserved |   |
| `USER_​DEFINED_​TYPE_​NAME` |   | non-reserved | non-reserved |   |
| `USER_​DEFINED_​TYPE_​SCHEMA` |   | non-reserved | non-reserved |   |
| `USING` | reserved | reserved | reserved | reserved |
| `UTF16` |   | non-reserved | non-reserved |   |
| `UTF32` |   | non-reserved | non-reserved |   |
| `UTF8` |   | non-reserved | non-reserved |   |
| `VACUUM` | non-reserved |   |   |   |
| `VALID` | non-reserved | non-reserved | non-reserved |   |
| `VALIDATE` | non-reserved |   |   |   |
| `VALIDATOR` | non-reserved |   |   |   |
| `VALUE` | non-reserved | reserved | reserved | reserved |
| `VALUES` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `VALUE_OF` |   | reserved | reserved |   |
| `VARBINARY` |   | reserved | reserved |   |
| `VARCHAR` | non-reserved (cannot be function or type) | reserved | reserved | reserved |
| `VARIADIC` | reserved |   |   |   |
| `VARYING` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `VAR_POP` |   | reserved | reserved |   |
| `VAR_SAMP` |   | reserved | reserved |   |
| `VERBOSE` | reserved (can be function or type) |   |   |   |
| `VERSION` | non-reserved | non-reserved | non-reserved |   |
| `VERSIONING` |   | reserved | reserved |   |
| `VIEW` | non-reserved | non-reserved | non-reserved | reserved |
| `VIEWS` | non-reserved |   |   |   |
| `VIRTUAL` | non-reserved |   |   |   |
| `VOLATILE` | non-reserved |   |   |   |
| `WHEN` | reserved | reserved | reserved | reserved |
| `WHENEVER` |   | reserved | reserved | reserved |
| `WHERE` | reserved, requires `AS` | reserved | reserved | reserved |
| `WHITESPACE` | non-reserved | non-reserved | non-reserved |   |
| `WIDTH_BUCKET` |   | reserved | reserved |   |
| `WINDOW` | reserved, requires `AS` | reserved | reserved |   |
| `WITH` | reserved, requires `AS` | reserved | reserved | reserved |
| `WITHIN` | non-reserved, requires `AS` | reserved | reserved |   |
| `WITHOUT` | non-reserved, requires `AS` | reserved | reserved |   |
| `WORK` | non-reserved | non-reserved | non-reserved | reserved |
| `WRAPPER` | non-reserved | non-reserved | non-reserved |   |
| `WRITE` | non-reserved | non-reserved | non-reserved | reserved |
| `XML` | non-reserved | reserved | reserved |   |
| `XMLAGG` |   | reserved | reserved |   |
| `XMLATTRIBUTES` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLBINARY` |   | reserved | reserved |   |
| `XMLCAST` |   | reserved | reserved |   |
| `XMLCOMMENT` |   | reserved | reserved |   |
| `XMLCONCAT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLDECLARATION` |   | non-reserved | non-reserved |   |
| `XMLDOCUMENT` |   | reserved | reserved |   |
| `XMLELEMENT` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLEXISTS` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLFOREST` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLITERATE` |   | reserved | reserved |   |
| `XMLNAMESPACES` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLPARSE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLPI` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLQUERY` |   | reserved | reserved |   |
| `XMLROOT` | non-reserved (cannot be function or type) |   |   |   |
| `XMLSCHEMA` |   | non-reserved | non-reserved |   |
| `XMLSERIALIZE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLTABLE` | non-reserved (cannot be function or type) | reserved | reserved |   |
| `XMLTEXT` |   | reserved | reserved |   |
| `XMLVALIDATE` |   | reserved | reserved |   |
| `YEAR` | non-reserved, requires `AS` | reserved | reserved | reserved |
| `YES` | non-reserved | non-reserved | non-reserved |   |
| `ZONE` | non-reserved | non-reserved | non-reserved | reserved |
