Re: LIMIT within UNION?

Andrew Perrin <clists@perrin.socsci.unc.edu> writes:
> SELECT ... FROM participants
> WHERE typenr=1 AND <eligibility>
> UNION
> SELECT ... FROM participants
> WHERE typenr=2 LIMIT 172
> ORDER BY zip;

I think you need

SELECT * FROM
(
SELECT ... FROM participants
WHERE typenr=1 AND <eligibility>
UNION
(SELECT ... FROM participants
WHERE typenr=2 LIMIT 172)
) ss
ORDER BY zip;

Not sure if the inner set of parens is essential, but it might be.
The outer SELECT superstructure is definitely necessary to give a
place to hang the ORDER BY on.
        regards, tom lane