I'm doing this now:sel AS (
SELECT i.id AS c_id
FROM (select id, row_number() OVER (ORDER BY id) AS rn FROM ins_table_1) i
JOIN rows s USING (rn)
)
UPDATE table_2 SET c_id =
(
SELECT c_id
FROM sel
ORDER BY c_id
)
WHERE clientid = 124312;But I get ERROR: more than one row returned by a subquery used as an _expression_
And this surprises you why?
I'd advise you get whatever it is you are trying to accomplish working using multiple queries in a transaction, probably with the help of temporary tables, then post that self-contained working example and ask for suggestions on how to turn it into a single query using CTEs (if its ever worth the effort at that point).
David J.
