Mysql update多表联合更新

下面我建两个表，并执行一系列sql语句，仔细观察sql执行后表中数据的变化，很容易就能理解多表联合更新的用法

student表                                                                         class表

     

1. 执行 UPDATE student s , class c SET s.class_name='test00',c.stu_name='test00' WHERE s.class_id = c.id

student表                                                                class表

    

2. 执行 UPDATE student s JOIN class c ON s.class_id = c.id SET s.class_name='test11',c.stu_name='test11'

student表                                                                  class表

    

3. 执行 UPDATE student s LEFT JOIN class c ON s.class_id = c.id SET s.class_name='test22',c.stu_name='test22'

student表                                                                      class表

    

4. 执行 UPDATE student s RIGHT JOIN class c ON s.class_id = c.id SET s.class_name='test33',c.stu_name='test33'

student表                                                                class表

    

5. 执行 UPDATE student s JOIN class c ON s.class_id = c.id SET s.class_name=c.name , c.stu_name=s.name

student表                                                                class表