Tests if a string argument can be converted to a date.

Syntax

ISDATE( string )

Parameters

Remarks

If a conversion is possible, the function returns 1; otherwise, 0 is returned. If the argument is NULL, 0 is returned.

This function supports NCHAR inputs and/or outputs.

Standards and compatibility

Example

The following example imports data from an external file, exports rows which contain invalid values, and copies the remaining rows to a permanent table.

CREATE GLOBAL TEMPORARY TABLE MyData(
      person VARCHAR(100),
      birth_date VARCHAR(30),
      height_in_cms VARCHAR(10)
   ) ON COMMIT PRESERVE ROWS;
   LOAD TABLE MyData FROM 'exported.dat';
   UNLOAD
      SELECT * FROM MyData
      WHERE ISDATE( birth_date ) = 0
  OR ISNUMERIC( height_in_cms ) = 0
   TO 'badrows.dat';
   INSERT INTO PermData
      SELECT person, birth_date, height_in_cms
      FROM MyData
      WHERE ISDATE( birth_date ) = 1
  AND ISNUMERIC( height_in_cms ) = 1;
   COMMIT;
   DROP TABLE MyData;