On Aug 6, 2009, at 15:31 , Josh Trutwin wrote:
Interestingly, this syntax is accepted in 8.3.7, but SELECT queries
fail:
CREATE TRIGGER trigger_test_upd_set_last_mod
BEFORE UPDATE ON test_upd
FOR EACH ROW EXECUTE PROCEDURE set_last_modified();
Then:
UPDATE test_upd SET foo = 'foo' WHERE id = 1;
ERROR: operator does not exist: test_upd <> test_upd
LINE 1: SELECT $1 != $2
^
HINT: No operator matches the given name and argument type(s). You
might need to add explicit type casts. QUERY: SELECT $1 != $2
CONTEXT: PL/pgSQL function "set_last_modified_test" line 2 at IF
That's not a SELECT query per se: AIUI it's how the evaluation of the
NEW != OLD expression is evaluated within the PL/pgSQL function as
part of the IF statement (note the "line 2 at IF" context line). It's
just saying the <> operator doesn't exist for the test_upd rowtype.
Michael Glaesemann
grzm seespotcode net
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