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Postgresql very slow query on indexed columns...

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Understanding COUNT behavior in queries vs. EXPLAIN vs. functions...

Count rows within a group, but also from global result set: performance issue...

mysql time for select not same as real lines...

Slow MySQL query, EXPLAIN shows Using temporary; Using filesort...

Clarification of join order for creation of temporary tables...

Why does the output of EXPLAIN change after each SHOW index?...

Slow Postgres 9.3 Queries, again...

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Optimization Mysql Query Left Join...

I don't understand explain result of a slow query...

Reuse computed select value...

Why MySQL not using index for join on single column (no where or group by)?...