On Tue, 2006-08-01 at 17:39 +0530, ViSolve DB Team wrote:
> Hello Prashant,
> 
> If you do need the duplicate rows in the final result, use UNION ALL with 
> your query. Otherwise you can opt for UNION as UNION is faster than UNION 
> ALL.

I have never heard of any evidence of this; in fact, it makes more sense
that the reverse would be true, as MySQL would not have to do an
implicit DISTINCT on the outermost resultset.

Prashant:

Please post an EXPLAIN of your original posted SQL query.  Use the /G
flag from the command line client to make it easier to read the results.
Thanks!

-jay


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