CodingMySQL GROUP BY headspafe

 

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 From:  Ben (BENLUMLEY)  
 To:  Matt     
30962.12 In reply to 30962.11 

i don't really know what it does and doesn't do ... just that it uses clevers to recognise queries that can be better performed differently, without actually trying the different versions.

 

I was under the impression that it did things like notice that one of the items in a group by is a unique index, so would ignore the rest?

 

No idea how i got this idea though, so its most probably wrong.

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