Re: Re: Does PostgreSQL support EXISTS? - Mailing list pgsql-general

From Joe Conway
Subject Re: Re: Does PostgreSQL support EXISTS?
Date
Msg-id 008001c0f471$50584da0$d7d310ac@jecw2k1
Whole thread Raw
In response to Re: Re: Does PostgreSQL support EXISTS?  (Bruce Momjian <pgman@candle.pha.pa.us>)
List pgsql-general
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Got it.  How does an IN subquery returning NULL behave differently from
> > one returning FALSE?  I can't think of a test that would be affected.
>
> After we fix IS TRUE and friends to respond to nulls correctly (Conway's
> promised to do that, IIRC) it'll be possible to write
>
> (foo IN (SELECT ...)) IS NOT FALSE
>
> and get the "intuitive" behavior.  But right now that doesn't work.
>

I'm still committed to it -- just want to finish up has_table_privilege
first -- shouldn't be too long now.

-- Joe


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