The GROUP BY is really fast :-)
Thank you.
Miroslav Šulc
Tom Lane napsal(a):
> Try
> SELECT Key FROM MRTPContactValue GROUP BY Key
>
> The "select distinct" code is a bit old and crufty, GROUP BY is usually
> smarter.
>
> regards, tom lane
>
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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