sql-关联表查询 2019-06-24

Liebe_you 推荐于2017-09-22

比如有三张表，student，teacher ， project :

1.第一种方法：select * from student,teacher,project where student.id=teacher.sid and student.id=project.sid;

 2.第二种：select * from student inner join teacher on student.id=teacher.sid inner join project on student.id=project.sid;