MYSQL查询之多表查询select嵌套的三种形式。

          可参考 https://www.jianshu.com/p/8b135d373df1

表的内容如下：

实现功能：查询没学过"张三"老师授课的同学的信息

实现语句：

 SELECT student.s_id,student.s_name FROM student WHERE s_id  not in (SELECT distinct( score.s_id) FROM score,course,teacher WHERE score.c_id=course. c_id AND course.t_id=teacher.t_id AND teacher.t_name='张三');

实现功能：查询学过编号为"01"并且也学过编号为"02"的课程的同学的信息

实现语句：

SELECT *from (SELECT s_id,s_score from score WHERE score.c_id ="01")as t1,(SELECT s_id,s_score from score WHERE score.c_id="02") as t2 WHERE t1.s_id=t2.s_id