Need help with optimizing a SQL query?

IN subselects are not optimised in MySQL. Instead of performing the subselect, and then the outser select, MySQL performs the subselect for each row matched by the outer select. Because of this, subselects in the IN clause should be replaced with joins.

Here is a faster version of the query.

This is crying out for normalisation. What you really need is an url table like.

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