Re: [GENERAL] Providing an alternative result when there is no result

[Martijn van Oosterhout]

On Mon, May 18, 2009 at 03:13:56PM -0400, Joshua Berry wrote:
> Hello all,
>
> 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?
>
> Currently we select the result into a temp table.
>
> SELECT INTO temp_table id FROM ... ;

What might work is:

SELECT EXISTS(subquery);

As in:

SELECT EXISTS( SELECT 1 WHERE true );

Have a nice day,
-- 
Martijn van Oosterhout   <klep...@svana.org>   http://svana.org/kleptog/
> Please line up in a tree and maintain the heap invariant while 
> boarding. Thank you for flying nlogn airlines.

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