On 11/30/25 19:07, Adrian Klaver wrote:
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."
Realized I was looking at current docs and I should be looking at your
version
From the 16 version of the docs:
"This form adds a new constraint to a table using the same constraint
syntax as CREATE TABLE, plus the option NOT VALID, which is currently
only allowed for foreign key and CHECK constraints."
Now I am not sure what you did.
Are you saying you used a CHECK constraint to check for NULL values?
If so then pg_constraint.convalidated would work.
If not are you sure you are on Postgres 16?
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Adrian Klaver
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