Re: ADD FOREIGN KEY (was Re: [GENERAL] 7.4Beta)

Stephan Szabo wrote:
> Hmm, my initial testing showed that it really was a little slower
> than a more complicated one with NOT EXISTS so I'd abandoned it. How does
> it fare for you compared to:
> select f1, f2 from fk where not exists (select 1 from pk where pk.f1=fk.f1
> and pk.f2=pk.f2) where fk.f1 is not null and fk.f2 is not null;
>
> I believe the above is the appropriate not exists form for match
> unspecified.
>
> I've actually got code (that no longer cleanly applies, but...) that uses
> the single query version with NOT EXISTS (which could be easily changed to
> either of the other forms) and was planning to put it together for a patch
> when 7.5 devel started because I figured it wasn't precisely a bug and
> wouldn't get accepted for 7.4.

I am a little lost on this point myself --- are we talking 7.4 or 7.5
for this change?

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