Re: Re: WHERE 1 = 1 (any info on this)

• Original Message -----

> im assuming this is an old 'trick' from RBO days. Alot of these are still floating around. Wasnt there one when you
wanted to force a full table scan you would go
>
> where num_field = 1 + 0;
>
> the + 0 forced the full table scan? I was on a project earlier this year and one guy told people to use it.
>

Actually, that one is still valid. Along with using any function around a predicate column. In general, an expression instead of the column name in a predicate will force ignoring of any conventional indexes on that column. Of course, function-based indexes were made just for that.

Cheers
Nuno Souto
nsouto_at_optusnet.com.au

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Author: Nuno Souto
  INET: nsouto_at_optusnet.com.au

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