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Re: Query optimization and index suggestion needed
Posted by: Peter Brawley
Date: May 25, 2020 09:12AM

Let's see the MySQL version, innodb_buffer_pool_size, no. of rows in `sales`, a few sample rows of data, and the results of ...

Show Table sales;
.
... and of Explain Extended on the query..

The 2nd Case needlessly repeats a test on year=2020, needs some optimising.

Is Only_Full_Group_By unset? Unless channel_name, index_code, index_label, index_id are fully determined by channel_id, returned values for those columns will be arbitrary, so they ought to be Grouped By.

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