On Jul 28, 2009, at 5:10 PM, nha wrote:
Hello,
Le 28/07/09 14:25, Daryl Richter a écrit :
On Jul 28, 2009, at 5:58 AM, Gau, Hans-Jürgen wrote:
hello list,
i have some problems with an sql-statement which runs on oracle but
not on postgresql (i want update only if result of SELECT is not
empty, the SELECT-queries are identical):
UPDATE table1 t1
SET (t1.id) =
(SELECT h.id FROM table2 t2,table3 t3, table1 t1
WHERE t3.field = t2.field
AND t2.id = t1.id
AND t1.id <> t3.id)
WHERE
(SELECT h.id FROM table2 t2,table3 t3, table1 t1
WHERE t3.field = t2.field
AND t2.id = t1.id
AND t1.id <> t3.id) IS NOT NULL;
Try this:
UPDATE table1 t1 [...]
WHERE
EXISTS (SELECT 1 FROM table2 t2,table3 t3, table1 t1
WHERE t3.field = t2.field
AND t2.id = t1.id
AND t1.id <> t3.id
AND h.id IS NOT NULL);
Beyond the solution brought by Daryl Richter, it seems that "h" is an
unbound alias in the original (and also in the suggested) query. Some
clarification would be helpful for further investigation.
Ahh, you're right. I didn't even notice that, just reformatted the
OPs query.
Regards.
--
nha / Lyon / France.
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Daryl
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