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  • 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

     原文地址:https://blog.csdn.net/u012604745/article/details/80642015

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  • 原文地址:https://www.cnblogs.com/dyh004/p/11328058.html
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