Re: Query optimize on large database
I'm confused, or the query is: it ...
- selects d2.owner_id
- groups by d1.owner_id
- self-joins on artist and title, not owner_id
- restricts d1.owner_id to one value
Grouping by a column that may have just one value makes no sense. Selecting a column that neither aggregates nor is aggregated will return arbitrary results.
In plain English, what is the query requirement?
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Re: Query optimize on large database
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