SELECT MD5('a');
mysql> mysql> SELECT MD5('a'); +----------------------------------+ | MD5('a') | +----------------------------------+ | 0cc175b9c0f1b6a831c399e269772661 | +----------------------------------+ 1 row in set (0.00 sec) mysql> mysql> SELECT MD5('A'); +----------------------------------+ | MD5('A') | +----------------------------------+ | 7fc56270e7a70fa81a5935b72eacbe29 | +----------------------------------+ 1 row in set (0.00 sec)