On Tue, May 19, 2009 at 7:00 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Merlin Moncure <mmoncure@gmail.com> writes:
>> On Mon, May 18, 2009 at 3:13 PM, Joshua Berry <yoberi@gmail.com> wrote:
>>> Is there an easy and efficient way to return a boolean false for a query
>>> that returns no result, and true for one that does return a result?
>
>> Probably the best general approach is to:
>
>> select count(*) = 1 from
>> (
>> <query> limit 1
>> )q;
>
> Seems like EXISTS() is much more straightforward ...
yes...I didn't notice david's response upthread. that is indeed very elegant.
merlin
