Well group by has performance issues for sure, you can solve that by using distinct + joins
Last updated
2 years ago.
@luknei Distinct isn't the same as group by. You can group by multiple fields for example.
Last updated
2 years ago.
This is one of the things that annoys me too. It was quite surprising to see it return incorrect results.
The count() function should already be implemented this way, but it is deliberately crippled because MySQL can't optimize subqueries.
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2 years ago.
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