Re: What is the difference?

On Fri, 6 Mar 2009 09:50:27 +0100
Oluwatope Akinniyi <topeakinniyi@hotmail.com> wrote:

>
> This
> SELECT 1 WHERE '95b5a221aeba15c' IN (E'\'' ||
> replace('95b5a221aeba15c+fb4e7219ab898ce+b08586cb81059f9','+',''',''')
> || E'\'') returns no row while
>
> SELECT 1 WHERE '95b5a221aeba15c' IN
> ('95b5a221aeba15c','fb4e7219ab898ce','b08586cb81059f9') returns a
> row.
>
> What is the difference between E'\'' ||
> replace('95b5a221aeba15c+fb4e7219ab898ce+b08586cb81059f9','+',''',''')
> || E'\'' and '95b5a221aeba15c','fb4e7219ab898ce','b08586cb81059f9'?

You assume that the statement is interpreted twice.
The first is comparing your needle with an array/recordset of just
one element
"'95b5a221aeba15c','fb4e7219ab898ce','b08586cb81059f9'"

--
Ivan Sergio Borgonovo
http://www.webthatworks.it