Re: [SQL] LIMIT 1 FOR UPDATE or FOR UPDATE LIMIT 1?

Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Larry Rosenman wrote:
> >> Why? If both old and new are acceptable, why not document it? 
> >> (Just curious, I'm not wedded to it). 
> 
> > Well, showing both versions adds confusion for no good reason,
> 
> Yes, particularly considering that LIMIT ... FOR UPDATE corresponds
> to the implementation behavior (LIMIT acts before FOR UPDATE) while
> FOR UPDATE ... LIMIT does not.
> 
> I concur with documenting only the preferred form (though there should
> be a note in gram.y explaining that we're supporting the old syntax
> for backward compatibility).

I originally thought the grammar would be ugly to support both, but in
fact it has almost the same number of actions as before, so we can keep
it around for a while if not forever.

I will update the gram.y comments to indicate it will live beyond 7.3.X.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
359-1001+  If your life is a hard drive,     |  13 Roberts Road +  Christ can be your backup.        |  Newtown Square,
Pennsylvania19073