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I can insert a row by using code below.
USE pmdb;
INSERT INTO md5_tbl (md5_val, username, password) VALUES(MD5('abcdef'), 'usna', MD5('Aa123456'));
How can i decrypt or decode password when i select the row by using username field?
Firstly, MD5 is a hashing algorithm = no decryption possible (except brute force attacks, but…)
Secondly, don’t use MD5 for hashing passwords, it isn’t secure at all. Instead, use at least SHA family + technique called “salting”.