Comparison Operators Table 24. Comparison Operator Precedence Operator Purpose Precedence IS Checks that the expression on the left is (not) NULL or the Boolean value on the right 1 = Is equal to Syntax IS [NOT] { TRUE | FALSE | UNKNOWN } The IS predicate with Boolean literal values checks if the expression on the left side matches the Chapter 4. Common Language Elements 96 Boolean An error message is returned otherwise.  Please note: If WITH CHECK OPTION is used, the engine checks the input against the WHERE clause before passing anything to the base relation. Therefore, if the

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 19.1. SHOW CHECKs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . little more assistance. For example, isql of Firebird 4.0 shows: SQL> show; Valid options are: CHECKs COMMENTs COLLATEs COLLATIONs DOMAINs described below. Where possible, examples from the employee database are shown. 19.1. SHOW CHECKs SQL> SHOW CHECKs table_name; This command displays all user-defined check constraints defined for a specific

Only an unambiguous false outcome will cause the input to be rejected. In practice, this means that checks like check ( value > 10000 ) check ( upper( value ) in ( 'A', 'B', 'X' ) ) check ( value between enforce CHECK constraints on existing rows when you add new fields. The same is true if you add checks to existing fields with ADD CONSTRAINT or ADD CHECK. This time, Firebird not only tolerates the columns as nullable, because the column type is not intrinsically NOT NULL. But it also shows the CHECKs, so you know how things stand. Likewise, the engine describes these columns as nullable when a

this was that everything that was read from data and meta data became subject to "well-formedness" checks. Hence, on restoring, those previously stored source and BLR objects are throwing "malformed string" names, are definitely not synonyms for /dev/stdin or /dev/stdout, they are simply literals that gbak checks for while processing its parameters. Do not attempt to use names /dev/stdin or /dev/stdout in a

library counts are handled automatically. You may provide the -f[orce] option to override version checks. Caution If you -f[orce] the installation, it could break another Firebird or InterBase® version where Installing on Windows 32 a dependent binary (.exe or .dll) resides, because of built-in checks for the folders that are the expected location of the runtimes that are equivalent to the compile-time

An error message is returned otherwise.  Please note: If WITH CHECK OPTION is used, the engine checks the input against the WHERE clause before passing anything to the base relation. Therefore, if the after each fetch and, if its value is zero, the loop has to be terminated. A FOR SELECT statement checks it automatically. Nevertheless, declared cursors provide a high level of control over sequential 1. There is no way to validate the syntax of the enclosed statement 2. There are no dependency checks to discover whether tables or columns have been dropped 3. Even though the performance in loops

gfix -⁠sh[utdown] command to shut down the database. When a database is validated the following checks are made and corrected by default: • Orphan pages are returned to free space. This updates the database

Password): The user must identify themselves with a Firebird username and password, which the server checks against the security database. The maximum effective password length is around 20 bytes, although

Native: The user must identify him/herself with a Firebird username and password, which the server checks against the security database. 2. Trusted: The user is automatically identified by his OS account

first part (1,024 bytes) of the first page in the first file of the database and runs a number of checks to ensure that the file is actually a database and so on. If the database is multi-file, then each