MySQL 根据条件用另一个表的列更新列值
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时间：2020-08-31 14:31:26 来源:igfitidea点击:
update columns values with column of another table based on condition
提问by niceApp
I have two tables...
我有两张桌子...
table1 ( id, item, price ) values:
table1 ( id, item, price ) 值：
id | item | price
-------------
10 | book | 20
20 | copy | 30
30 | pen | 10
....table2 ( id, item, price) values:
....table2 ( id, item, price) 值：
id | item | price
-------------
10 | book | 20
20 | book | 30
Now I want to:
现在我想：
update table1
set table1.Price = table2.price
where table1.id = table2.id
and table1.item = table2.item.
How do I do it?
我该怎么做？
回答by RageZ
Something like this should do it :
像这样的事情应该这样做：
UPDATE table1
SET table1.Price = table2.price
FROM table1 INNER JOIN table2 ON table1.id = table2.id
You can also try this:
你也可以试试这个：
UPDATE table1
SET price=(SELECT price FROM table2 WHERE table1.id=table2.id);
回答by Nadeem
This will surely work:
这肯定会奏效：
UPDATE table1
SET table1.price=(SELECT table2.price
FROM table2
WHERE table2.id=table1.id AND table2.item=table1.item);
