This question shows how to do outer join in mysql, but can I do a full outer join between sub-queries as tables without having to re-execute the sub-queries for each half of the union?
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This question shows how to do outer join in mysql, but can I do a full outer join between sub-queries as tables without having to re-execute the sub-queries for each half of the union?
I’m afraid you can’t, but the query optimizer may be smart enough to keep the performance hit to a minimum.