mysql下更新查詢出的資料的語句upda set select,mysqlupda

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mysql下更新查詢出的資料的語句upda set select,mysqlupda

在oracle 等資料庫中可以使用 update wwm2 set wwm2.town=(select wwm5.town from wwm5 where wwm5.id=wwm2.id) 這種格式的句子更新資料庫,但是我最近用mysql 發現不能這樣使用,所以在網上查了下,發現mysql用另一種語句解決了,inner join:::;

應該使用inner join,即:UPDATE friends INNER JOIN users ON friends.friendid=users.useridSET friends.friendname=users.username

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