DECODE(crypt_str,pass_str) decrypts the encrypted string crypt_str using pass_str. : DECODE « Encryption Compression Functions « MySQL Tutorial

1. MySQL Tutorial
2. Encryption Compression Functions
3. DECODE

crypt_str should be a string returned from ENCODE().

mysql>
mysql> select decode(encode("text","password"),"password");
+----------------------------------------------+
| decode(encode("text","password"),"password") |
+----------------------------------------------+
| text                                         |
+----------------------------------------------+
1 row in set (0.00 sec)

mysql>