Exemples
DECLARE EXTERNAL FUNCTION addDay
TIMESTAMP, INT
RETURNS TIMESTAMP
ENTRY_POINT 'addDay' MODULE_NAME 'fbudf';
DECLARE EXTERNAL FUNCTION invl
INT BY DESCRIPTOR, INT BY DESCRIPTOR
RETURNS INT BY DESCRIPTOR
ENTRY_POINT 'idNvl' MODULE_NAME 'fbudf';
DECLARE EXTERNAL FUNCTION isLeapYear
TIMESTAMP
RETURNS INT BY VALUE
ENTRY_POINT 'isLeapYear' MODULE_NAME 'fbudf';
DECLARE EXTERNAL FUNCTION i64Truncate
NUMERIC(18) BY DESCRIPTOR, NUMERIC(18) BY DESCRIPTOR
RETURNS PARAMETER 2
ENTRY_POINT 'fbtruncate' MODULE_NAME 'fbudf';
ALTER EXTERNAL FUNCTION,DROP EXTERNAL FUNCTION,CREATE FUNCTION.