Re: JOIN problem

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On Monday 07 February 2005 18:22, Zouari Fourat wrote:
> Hello
> I have 2 tables with two columns in each one (cloned tables) like this :
>
> ID int(6)
> UserName varchar(25)
>
> and i would like to select usernames from table1 that doesnt appear in
> table2 so i did this :

Depending on which database you're using you may be able to do this:

SELECT a.username
FROM table1 a
WHERE a.username NOT IN ( SELECT b.username FROM table2 b )

cheers Simon
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