"Philippe Lang" <philippe.l...@attiksystem.ch> writes:
> I was trying to run this query this morning:
> --------------------------
> SELECT
> r.*,
> (
> SELECT
> rl.reminder_header,
> rl.reminder_footer
> FROM reminder_levels AS rl
> WHERE rl.lookup =
> (
> SELECT MAX(reminder_level_lookup)
> FROM reminders
> WHERE customer_id = r.customer_id
> )
> )
> FROM reminders AS r
> --------------------------
> Postgresql replied that:
> --------------------------
> ERROR: subquery must return only one column
Since 8.0 or so you could write the sub-select as
SELECT ROW(rl.reminder_header, rl.reminder_footer) FROM ...
We ought to make that happen automatically, but it's not real
high on the to-do list.
regards, tom lane
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