williamI am trying to add/change a constraint programmatically, but not if it already exists, and is the same as before. I can so something like (may not be precise ...) select check_clause from information_schema.check_constraints where constraint_name = 'my-name' but this returns that clause in a normalised format that is not compatible with the text I am trying to compare, so I'm adding something like ... alter table my_table add check (my_type = any (array['GOOD' , 'BAD'])) but the check_clause from above looks like ... (((my_type)::text = ANY (ARRAY['GOOD'::text, 'BAD'::text]))) Is there a way of getting the "normalised" version of constraint so decide if I need to update the constraint if one already exists? Steve
