Richard Huxton wrote:
Heikki Linnakangas wrote:
The problem is that the new tuple version is checked only against the
condition in the update rule, id=OLD.id, but not the condition in the
original update-claus, dt='a'.
Yeah, that's confusing :(.
Bit more than just normal rule confusion I'd say. Try the following two
statements in parallel (assuming you've just run the previous):
UPDATE test SET dt='c';
UPDATE test SET dt='x' FROM test t2 WHERE test.id=t2.id AND t2.dt='b';
This isn't a problem with the view mechanism - it's a problem with
re-checking clauses involving subqueries or joins I'd guess.
I don't understand the PostgreSQL specific *FROM* clause correctly.
Currently the relations in the *FROM* clause seem to be read only
and UPDATE operations seem to acquire no tuple level lock on them.
regards,
Hiroshi Inoue
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