mysql reference result from subquery

Posted by iamrohitbanga on Stack Overflow See other posts from Stack Overflow or by iamrohitbanga
Published on 2010-03-13T15:46:24Z Indexed on 2010/03/13 15:55 UTC
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sql

this is what i am doing

update t1 set x=a,y=b where a and b are obtained from (select query here)

i know the select query
the select query returns multiple results which are the same
when i use group by or distinct query execution slows down considerably
a and b are forward references so mysql reports an error
i want to set a equal to the value obtained in the first row and b equal to the value obtained in the first row for the respective columns, to avoid group by. i don't know how to refer to the first result from the select query.

how can i achieve all this?

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