Mysql for navicat 之多表连接查询

新建两张表：

course：                                     student：

                       

1、外连接：左连接、右连接和完全外连接

左连接：select * from student left join course on student.ID=course.ID

右连接：select * from student right join course on student.ID=course.ID

完全外连接：select * from student full join course on student.ID=course.ID

2、内连接：select * from student inner join course on student.ID=course.ID（select * from student,course where student.ID=course.ID）

3、交叉连接：select * from student cross join course