How MySQL Optimizes WHERE Clauses

Some of the optimizations performed by MySQL on where clauses as follow: Removal of unnecessary parentheses: ((a AND b) AND c OR (((a AND b) AND (c AND d)))) To (a AND b AND c) OR (a AND b AND c AND d) Constant folding: (a<b AND b=c) AND a=5 To b>5 AND b=c AND … Read more