插入SQL Server 2005

Question

我有一個簡單的問題。 我有兩個表FROM和TO 。 我想將列Group從FROM復制到TO但只復制與id_number匹配的id_number 。 它應該很簡單，但我卡住了。

insert into TO (Group)
   SELECT Group 
   FROM FROM
   WHERE FROM.id_number like TO.id_number

要么

INSERT INTO TO (Group)
   SELECT Group 
   FROM FROM
   WHERE id_number IN (SELECT id_number FROM TO)

這個只是在表中添加了額外的列，它不會根據id_number更新行....

任何想法？

Answer 1

你說“只有與id_number匹配的行”。 這意味着update不insert 。

update [TO] set [Group] = [FROM].[Group]
from [FROM]
inner join [TO] on [FROM].id_number = [TO].id_number