I have a postgres database (v9.6) and I have multiple CHECK constraints that use user-defined functions.

something like:

CREATE TABLE payment (
  amount bigint,
  CONSTRAINT amount_gt_0 CHECK (round_amount(amount) > 0)

where round_amount is user-defined function.

Is it possible to get a list of all constraint or at least tables that use such constraints?

postgresql version is 9.6

2 Answers 2


It looks like that there is already a view called information_schema.check_constraint_routine_usage that provide this information.

The view originally only shows routines owned by the current role but you can find the original query by typing \d+ information_schema.check_constraint_routine_usage and tweak it.


Do you mean this?

   pg_catalog.pg_constraint const
   INNER JOIN pg_catalog.pg_class cls ON cls.oid = const.conrelid
   INNER JOIN pg_catalog.pg_namespace ns ON ns.oid = const.connamespace
   ns.nspname = '<your_schema>'
   AND const.contype = 'c'
   AND const.consrc like '%round_amount%'
  • That query assumes that I already know the function name round_amount but in my case I don't. I'm trying to find every constraint that relies on user-defined function.
    – eyadof
    Dec 4, 2018 at 6:12

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