On 30/03/12 08:46, Pavel Stehule wrote:
2012/3/30 Richard Huxton<d...@archonet.com>:
On 29/03/12 23:28, Pavel Stehule wrote:
select anum from t1 where anum = 4
union all select 100 limit 1;
I'm not sure the ordering here is guaranteed by the standard though, is it?
You could end up with the 4 being discarded.
A order is random for only "UNION", "UNION ALL" should to respect
order. But I didn't check it in standard.
Let's put it this way - a quick bit of googling can't find anything that
says the order *is* guaranteed, and (almost?) no other operations do so
by default.
--
Richard Huxton
Archonet Ltd
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