mysql通过关联修改表中两个字段的值_MySQL

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mysql通过关联修改表中两个字段的值

 

Sql代码

 

update  A set a_field= 

 

(select realname from B where A.extension=B.extension  and  B.extension '')    

  

update A a  inner join B b on a.extension=b.extension and a.extension '' 

 

set a.extenrealname =b.realname

 

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