问题描述
我有两个表需要完全相同的值用于非规范化目的.
I have two tables that need the exact same values for denormalization purposes.
这是查询.
第一张桌子
UPDATE Table_One
SET win = win+1, streak = streak+1, score = score+200
WHERE userid = 1 AND lid = 1 LIMIT 1
第二张桌子
UPDATE Table_Two
SET win = win+1, streak = streak+1, score = score+200
WHERE userid = 1 LIMIT 1
正如您所看到的，两个表之间的唯一区别是它们的名称，而第二个表没有 lid
As you can see the only difference between both tables is their name and table two doesn't have the field lid
无论如何要将两个更新合并为一个?
Anyway to combine both updates to just one?
推荐答案
应该可以使用多表更新，如文档中所述.
It should be possible with a multi-table update, as described in the documentation.
http://dev.mysql.com/doc/refman/5.5/en/update.html
UPDATE Table_One a INNER JOIN Table_Two b ON (a.userid = b.userid)
SET
a.win = a.win+1, a.streak = a.streak+1, a.score = a.score+200,
b.win = b.win+1, b.streak = b.streak+1, b.score = b.score+200
WHERE a.userid = 1 AND a.lid = 1 AND b.userid = 1
注意:Multi-table 不支持 LIMIT，所以这可能会导致更多的悲伤，具体取决于细节.
Note: Multi-table doesn't support LIMIT, so this could cause more grief depending on the details.
存储过程或事务可能是更好的解决方案.
Stored procedures or transactions may be a nicer solution.
这篇关于MySql 一次更新两个表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！