Re: Very slow query when too many joins
Posted by:
As Os
Date: June 05, 2016 10:48AM
It 's user created fields.
Table 'field' holds the id, the name of the field and it's options.
Table 'fields_values' holds the the values of the fields.
They're joined with: id->field_id
Table 'ads' holds it's id and the fields' ids.
If one row of 'ads' has 27 fields it has to make 27 JOINS to take the values from 'fields_values' table.
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