Re: PL/pgSQL PERFORM with CTE

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От Pavel Stehule
Тема Re: PL/pgSQL PERFORM with CTE
Дата
Msg-id CAFj8pRC2n5wTYn7=1Fz7uNVYpX4pAi3FXV=8yM5SXtxH02gbsg@mail.gmail.com
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Ответ на Re: PL/pgSQL PERFORM with CTE  ("David E. Wheeler" <david@justatheory.com>)
Ответы Re: PL/pgSQL PERFORM with CTE
Re: PL/pgSQL PERFORM with CTE
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2013/8/20 David E. Wheeler <david@justatheory.com>
On Aug 20, 2013, at 2:41 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:

> yes, in this context you should not use a PERFORM
>
> PL/pgSQL protect you before useless queries - so you can use a CTE without returned result directly or CTE with result via PERFORM statement (and in this case it must be unmodifing CTE).
>
> Sorry, I don't see any problem - why you return some from CTE and then you throw this result?

I am passing the values returned from a CTE to a call to pg_notify(). I do not care to collect the output of pg_notify(), which returns VOID.

it is little bit different issue - PL/pgSQL doesn't check if returned type is VOID - it can be allowed, I am thinking. So check of empty result can be enhanced.

Regards

Pavel
 

Best,

David


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