dear friends

i m having many fields in many tables which are required to have some
minimum length strings

so i thought to define DOMAIN for such kind of field, like following

CREATE DOMAIN CODENAME VARCHAR(50) CHECK ( strlen( Value ) > 5 ) );

but it generates error,

is there any way to use UDFs in CHECK constraints , so that i dont have to
write same code in all triggers


Thanks
Kamlesh