Tom Lane wrote:
lrotger <lrotger@xxxxxxxxxxxx> writes:
I know I could dig this out of the manuals so don't be too hard on me,
I'd like to know how to query the actual text of the expression of a
constraint. I know the name of the constraint and of the table.
Something like this:
regression=# create table t1 (f1 int constraint c1 check (f1 > 0));
CREATE TABLE
regression=# select pg_get_constraintdef(c.oid)
regression-# from pg_constraint c join pg_class t on c.conrelid = t.oid
regression-# where t.relname = 't1' and c.conname = 'c1';
pg_get_constraintdef
----------------------
CHECK ((f1 > 0))
(1 row)
You can probably also get it from the information_schema.
regards, tom lane
I forgot to mention that my version is 7.2.1. I replaced the column
names for the ones I see in my installation hoping it would work but the
function, pg_get_conbstraintdef() doesn't exist.
I see that information_schema was introduced in 8.0 too.
Anyway I found out that \d table shows the table definition so it's solved.
Thanks a lot
L Rotger
