On 11/30/25 16:59, Stuart Campbell wrote:
> Hello,
>
> I have several NOT NULL check constraints in my schema that were
> originally added as NOT VALID. I would like to determine whether they
> have all since been validated, or not.
>
> I thought maybe pg_constraint.convalidated might help, but it seems like
> the version of Postgres I'm using (16) doesn't store not null
> constraints in that table. And even in later versions, maybe it doesn't
> hold the information I need.
>
> Is there another way to discover this?
1) Select count(*) from <table> where <col> IS NULL;
2) From here
https://www.postgresql.org/docs/current/sql-altertable.html#SQL-ALTERTABLE-NOTES
ALTER TABLE <table> VALIDATE CONSTRAINT <constraint_name>;
As described:
". Once the constraint is in place, no new violations can be inserted,
and the existing problems can be corrected at leisure until VALIDATE
CONSTRAINT finally succeeds."
>
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--
Adrian Klaver
adrian.klaver@aklaver.com
