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Continue to Chathow to optimize a mysql query with the union of 30 tables(all tables are indexed but result is really very slow) https://www.letsknowit.com////how-to-optimize-a-mysql-query-with-the-union-of-30-tables
how to optimize a mysql query with the union of 30 tables(all tables are indexed but result is really very slow) https://www.letsknowit.com////how-to-optimize-a-mysql-query-with-the-union-of-30-tables