dljd_(011-015)_简单的查询

一、不等号查询条件

　　1.1查询学生表(student)中年龄(age)不等于20的所有学生信息　　 

        select * from student where age<>20;

        select * from student where age!=20;
　　　　 select * from student where Birthday<>'1998-05-03'