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[nycphp-talk] simple mysql query help

cesar can at andrew.cmu.edu
Tue Aug 6 11:54:16 EDT 2002


i've attempted but solutions, neither seem to work.

i'm upgrading the mysql from 3.23.44 to 3.23.51... hopefully that will do
it.

On Tue, 6 Aug 2002, Michael Southwell wrote:

> how about this (haven't tested it)?  select aaa.*,bbb.* from aaa,bbb where
> aaa.a!=bbb.a and bbb.a!=aaa.a;
>
> At 11:16 AM 8/6/2002, you wrote:
>
> >i have two tables aaa and bbb
> >aaa has {1 , 2}
> >bbb has {1 , 3 }
> >
> >i want select those values in aaa that don't appear in bbb, and also
> >another query that will delete those values in aaa which don't appear in
> >bbb. if someone can please help me, i'm just a little stuck. i know i
> >figured it out before, but right now i have no clue.
> >
> >  A)
> >mysql> select * from aaa;
> >+------+
> >| a    |
> >+------+
> >|    1 |
> >|    2 |
> >+------+
> >
> >mysql> select * from bbb;
> >+------+
> >| a    |
> >+------+
> >|    1 |
> >|    3 |
> >+------+
> >
> >B)i understand why this does what it does, but how do i correct it?
> >mysql> select aaa.*, bbb.* from aaa, bbb where aaa.a != bbb.a;
> >+------+------+
> >| a    | a    |
> >+------+------+
> >|    2 |    1 |
> >|    1 |    3 |
> >|    2 |    3 |
> >+------+------+
> >
> >thnka you in advance.
>
> Michael G. Southwell =================================
> DNEBA Enterprises
> 81 South Road
> Bloomingdale, NJ 07403-1419
> 973/492-7873 (voice and fax)
> southwell at dneba.com
> http://www.dneba.com
> ======================================================
>
>
>
>
>




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