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
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
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);
thanks, hans
--
Daryl
http://itsallsemantics.com
""Everyone thinks of changing the world, but no one thinks of changing
himself."
- Leo Tolstoy
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