我们用到最多的update更新数据都是单表更新了，但有的时候我们不得不使用关联多表进行数据更新了，下面我给各位介绍利用upate实现多表关联更新。
对单表执行更新没有什么好说的，无非就是update table_name set col1 = xx,col2 = yy where col = zz，主要就是where条件的设置。有时候更新某个表可能会涉及到多张数据表，例如：
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update table_1 set score = score + 5 where uid in ( uid from table_2 where sid = 10); 其实update也可以用到left join、inner join来进行关联，可能执行效率更高，把上面的sql替换成join的方式如下： update table_1 t1 inner join table_2 t2 on t1.uid = t2.uid set score = score + 5 where t2.sid = 10; |
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mysql关联多表进行update更新操作
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