From: | Rasmus Resen Amossen <spunk(at)rhk(dot)dk> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | subselects in check clauses |
Date: | 2001-06-04 20:48:47 |
Message-ID: | 3B1BF42F.CE6E24EB@rhk.dk |
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Lists: | pgsql-general |
I have a need to check if a certain condition holds for all rows that
matches a given criteria. But postgresql appearently doesn't support
subselects in check clauses. Here is an example:
CREATE TABLE example (a int, b date, c date
CONSTRAINT csname CHECK (1 >= ALL (SELECT count(*)
FROM example
WHERE age(now(),b) > '0:0'
AND age(now(),c) < '0:0'
GROUP BY a)));
CREATE
INSERT INTO example VALUES (0,'2001-3-01','2001-12-12');
ERROR: ExecEvalExpr: unknown expression type 108
What can I do?
--
Rasmus Resen Amossen | stud.mat.dat at the University of Copenhagen
Jagtvej 120, -244 | http://www.math.ku.dk/muh
2200 Kbh. N | http://w1.1444.telia.com/~u144400001
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