Oracle-L: RE: WHERE 1 = 1 (any info on this)

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 21 Oct 2003 08:14:26 -0800
Message-ID: <F001.005D3DF3.20031021081426@fatcity.com>

I have seen people use this in pseudo-dynamic sql in a beast called SQR. Especially when they have code like ...

select ...
union
select ...
union
select ...
union
select ... limit to your imagination.

Lot of people think that using 1=1 in absence of a valid limiting condition will let them evaluate (and get data from) a union clause where as putting 1=2 will help them avoid ...

I don't hate just because I don't like SQR, I don't like it because until CBO encounters and evaluates 1=2 clause, it still does all the work of selecting etc and that is just a waste.

Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

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Author: Jamadagni, Rajendra
INET: Rajendra.Jamadagni_at_espn.com

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