The following terms have a special meaning in Firebird 2.5 DSQL. Some of them are also
                reserved words, others are not.
         
         
            
               
                  
                     !< | 
                     ^< | 
                     ^= | 
                  
                  
                     ^> | 
                     , | 
                     := | 
                  
                  
                     != | 
                     !> | 
                     ( | 
                  
                  
                     ) | 
                     < | 
                     <= | 
                  
                  
                     <> | 
                     = | 
                     > | 
                  
                  
                     >= | 
                     || | 
                     ~< | 
                  
                  
                     ~= | 
                     ~> | 
                     ABS | 
                  
                  
                     | ACCENT | 
                     ACOS | 
                     ACTION | 
                  
                  
                     | ACTIVE | 
                     ADD | 
                     ADMIN | 
                  
                  
                     | AFTER | 
                     ALL | 
                     ALTER | 
                  
                  
                     | ALWAYS | 
                     AND | 
                     ANY | 
                  
                  
                     | AS | 
                     ASC | 
                     ASCENDING | 
                  
                  
                     | ASCII_CHAR | 
                     ASCII_VAL | 
                     ASIN | 
                  
                  
                     | AT | 
                     ATAN | 
                     ATAN2 | 
                  
                  
                     | AUTO | 
                     AUTONOMOUS | 
                     AVG | 
                  
                  
                     | BACKUP | 
                     BEFORE | 
                     BEGIN | 
                  
                  
                     | BETWEEN | 
                     BIGINT | 
                     BIN_AND | 
                  
                  
                     | BIN_NOT | 
                     BIN_OR | 
                     BIN_SHL | 
                  
                  
                     | BIN_SHR | 
                     BIN_XOR | 
                     BIT_LENGTH | 
                  
                  
                     | BLOB | 
                     BLOCK | 
                     BOTH | 
                  
                  
                     | BREAK | 
                     BY | 
                     CALLER | 
                  
                  
                     | CASCADE | 
                     CASE | 
                     CAST | 
                  
                  
                     | CEIL | 
                     CEILING | 
                     CHAR | 
                  
                  
                     | CHAR_LENGTH | 
                     CHAR_TO_UUID | 
                     CHARACTER | 
                  
                  
                     | CHARACTER_LENGTH | 
                     CHECK | 
                     CLOSE | 
                  
                  
                     | COALESCE | 
                     COLLATE | 
                     COLLATION | 
                  
                  
                     | COLUMN | 
                     COMMENT | 
                     COMMIT | 
                  
                  
                     | COMMITTED | 
                     COMMON | 
                     COMPUTED | 
                  
                  
                     | CONDITIONAL | 
                     CONNECT | 
                     CONSTRAINT | 
                  
                  
                     | CONTAINING | 
                     COS | 
                     COSH | 
                  
                  
                     | COT | 
                     COUNT | 
                     CREATE | 
                  
                  
                     | CROSS | 
                     CSTRING | 
                     CURRENT | 
                  
                  
                     | CURRENT_CONNECTION | 
                     CURRENT_DATE | 
                     CURRENT_ROLE | 
                  
                  
                     | CURRENT_TIME | 
                     CURRENT_TIMESTAMP | 
                     CURRENT_TRANSACTION | 
                  
                  
                     | CURRENT_USER | 
                     CURSOR | 
                     DATA | 
                  
                  
                     | DATABASE | 
                     DATE | 
                     DATEADD | 
                  
                  
                     | DATEDIFF | 
                     DAY | 
                     DEC | 
                  
                  
                     | DECIMAL | 
                     DECLARE | 
                     DECODE | 
                  
                  
                     | DEFAULT | 
                     DELETE | 
                     DELETING | 
                  
                  
                     | DESC | 
                     DESCENDING | 
                     DESCRIPTOR | 
                  
                  
                     | DIFFERENCE | 
                     DISCONNECT | 
                     DISTINCT | 
                  
                  
                     | DO | 
                     DOMAIN | 
                     DOUBLE | 
                  
                  
                     | DROP | 
                     ELSE | 
                     END | 
                  
                  
                     | ENTRY_POINT | 
                     ESCAPE | 
                     EXCEPTION | 
                  
                  
                     | EXECUTE | 
                     EXISTS | 
                     EXIT | 
                  
                  
                     | EXP | 
                     EXTERNAL | 
                     EXTRACT | 
                  
                  
                     | FETCH | 
                     FILE | 
                     FILTER | 
                  
                  
                     | FIRST | 
                     FIRSTNAME | 
                     FLOAT | 
                  
                  
                     | FLOOR | 
                     FOR | 
                     FOREIGN | 
                  
                  
                     | FREE_IT | 
                     FROM | 
                     FULL | 
                  
                  
                     | FUNCTION | 
                     GDSCODE | 
                     GEN_ID | 
                  
                  
                     | GEN_UUID | 
                     GENERATED | 
                     GENERATOR | 
                  
                  
                     | GLOBAL | 
                     GRANT | 
                     GRANTED | 
                  
                  
                     | GROUP | 
                     HASH | 
                     HAVING | 
                  
                  
                     | HOUR | 
                     IF | 
                     IGNORE | 
                  
                  
                     | IIF | 
                     IN | 
                     INACTIVE | 
                  
                  
                     | INDEX | 
                     INNER | 
                     INPUT_TYPE | 
                  
                  
                     | INSENSITIVE | 
                     INSERT | 
                     INSERTING | 
                  
                  
                     | INT | 
                     INTEGER | 
                     INTO | 
                  
                  
                     | IS | 
                     ISOLATION | 
                     JOIN | 
                  
                  
                     | KEY | 
                     LAST | 
                     LASTNAME | 
                  
                  
                     | LEADING | 
                     LEAVE | 
                     LEFT | 
                  
                  
                     | LENGTH | 
                     LEVEL | 
                     LIKE | 
                  
                  
                     | LIMBO | 
                     LIST | 
                     LN | 
                  
                  
                     | LOCK | 
                     LOG | 
                     LOG10 | 
                  
                  
                     | LONG | 
                     LOWER | 
                     LPAD | 
                  
                  
                     | MANUAL | 
                     MAPPING | 
                     MATCHED | 
                  
                  
                     | MATCHING | 
                     MAX | 
                     MAXIMUM_SEGMENT | 
                  
                  
                     | MAXVALUE | 
                     MERGE | 
                     MIDDLENAME | 
                  
                  
                     | MILLISECOND | 
                     MIN | 
                     MINUTE | 
                  
                  
                     | MINVALUE | 
                     MOD | 
                     MODULE_NAME | 
                  
                  
                     | MONTH | 
                     NAMES | 
                     NATIONAL | 
                  
                  
                     | NATURAL | 
                     NCHAR | 
                     NEXT | 
                  
                  
                     | NO | 
                     NOT | 
                     NULL | 
                  
                  
                     | NULLIF | 
                     NULLS | 
                     NUMERIC | 
                  
                  
                     | OCTET_LENGTH | 
                     OF | 
                     ON | 
                  
                  
                     | ONLY | 
                     OPEN | 
                     OPTION | 
                  
                  
                     | OR | 
                     ORDER | 
                     OS_NAME | 
                  
                  
                     | OUTER | 
                     OUTPUT_TYPE | 
                     OVER | 
                  
                  
                     | OVERFLOW | 
                     OVERLAY | 
                     PAD | 
                  
                  
                     | PAGE | 
                     PAGE_SIZE | 
                     PAGES | 
                  
                  
                     | PARAMETER | 
                     PASSWORD | 
                     PI | 
                  
                  
                     | PLACING | 
                     PLAN | 
                     POSITION | 
                  
                  
                     | POST_EVENT | 
                     POWER | 
                     PRECISION | 
                  
                  
                     | PRESERVE | 
                     PRIMARY | 
                     PRIVILEGES | 
                  
                  
                     | PROCEDURE | 
                     PROTECTED | 
                     RAND | 
                  
                  
                     | RDB$DB_KEY | 
                     READ | 
                     REAL | 
                  
                  
                     | RECORD_VERSION | 
                     RECREATE | 
                     RECURSIVE | 
                  
                  
                     | REFERENCES | 
                     RELEASE | 
                     REPLACE | 
                  
                  
                     | REQUESTS | 
                     RESERV | 
                     RESERVING | 
                  
                  
                     | RESTART | 
                     RESTRICT | 
                     RETAIN | 
                  
                  
                     | RETURNING | 
                     RETURNING_VALUES | 
                     RETURNS | 
                  
                  
                     | REVERSE | 
                     REVOKE | 
                     RIGHT | 
                  
                  
                     | ROLE | 
                     ROLLBACK | 
                     ROUND | 
                  
                  
                     | ROW_COUNT | 
                     ROW_NUMBER | 
                     ROWS | 
                  
                  
                     | RPAD | 
                     SAVEPOINT | 
                     SCALAR_ARRAY | 
                  
                  
                     | SCHEMA | 
                     SECOND | 
                     SEGMENT | 
                  
                  
                     | SELECT | 
                     SENSITIVE | 
                     SEQUENCE | 
                  
                  
                     | SET | 
                     SHADOW | 
                     SHARED | 
                  
                  
                     | SIGN | 
                     SIMILAR | 
                     SIN | 
                  
                  
                     | SINGULAR | 
                     SINH | 
                     SIZE | 
                  
                  
                     | SKIP | 
                     SMALLINT | 
                     SNAPSHOT | 
                  
                  
                     | SOME | 
                     SORT | 
                     SOURCE | 
                  
                  
                     | SPACE | 
                     SQLCODE | 
                     SQLSTATE (2.5.1)
                      | 
                  
                  
                     | SQRT | 
                     STABILITY | 
                     START | 
                  
                  
                     | STARTING | 
                     STARTS | 
                     STATEMENT | 
                  
                  
                     | STATISTICS | 
                     SUB_TYPE | 
                     SUBSTRING | 
                  
                  
                     | SUM | 
                     SUSPEND | 
                     TABLE | 
                  
                  
                     | TAN | 
                     TANH | 
                     TEMPORARY | 
                  
                  
                     | THEN | 
                     TIME | 
                     TIMEOUT | 
                  
                  
                     | TIMESTAMP | 
                     TO | 
                     TRAILING | 
                  
                  
                     | TRANSACTION | 
                     TRIGGER | 
                     TRIM | 
                  
                  
                     | TRUNC | 
                     TWO_PHASE | 
                     TYPE | 
                  
                  
                     | UNCOMMITTED | 
                     UNDO | 
                     UNION | 
                  
                  
                     | UNIQUE | 
                     UPDATE | 
                     UPDATING | 
                  
                  
                     | UPPER | 
                     USER | 
                     USING | 
                  
                  
                     | UUID_TO_CHAR | 
                     VALUE | 
                     VALUES | 
                  
                  
                     | VARCHAR | 
                     VARIABLE | 
                     VARYING | 
                  
                  
                     | VIEW | 
                     WAIT | 
                     WEEK | 
                  
                  
                     | WEEKDAY | 
                     WHEN | 
                     WHERE | 
                  
                  
                     | WHILE | 
                     WITH | 
                     WORK | 
                  
                  
                     | WRITE | 
                     YEAR | 
                     YEARDAY |