SQL Server更新从另一个表中获取ID

Question

我必须更新表中的某些行，但我需要从另一个表中获取引用ID。表结构类似于下面：

CoInvDept 
+--------------+--------+--------+ 
| coinvdeptid | coinv | code | 
+--------------+--------+--------+ 

Coinv 
+--------------+-------------+ 
| coinv  | itemnumber | 
+--------------+-------------+ 

我需要更新代码，但我有itemnumber。我使用SQL Server 2008的 到目前为止

UPDATE coinvdept 
SET code = 'ABC123' 
WHERE (SELECT coinvid WHERE itemnumber = '12345678') 

Answer 1

我想这是你所追求的：

UPDATE coinvdept 
SET code = 'ABC123' 
WHERE coinv IN (SELECT coinvid FROM coinv WHERE itemnumber = '12345678') 

Answer 2

UPDATE coinvdept 
SET code = 'ABC123' 
WHERE coinv = (SELECT coinvid FROM coinv WHERE itemnumber = '12345678') 

OR

UPDATE T1 

SET code='ABC123' 

FROM coinvdept as T1 
INNER JOIN Coinv as T2 ON T1.coinv=T2.coinv 

AND T2.itemnumber='12345678' 

双方应努力:)

Answer 3

您可以使用in操作来匹配子查询结果的价值，你需要在子查询中from条款：

update 
    coinvdept 
set 
    code = 'ABC123' 
where 
    coinv in (select coinv from coinv where itemnumber = '12345678') 

你也可以使用一个连接：

update 
    d 
set 
    code = 'ABC123' 
from 
    coinvdept d 
    inner join coinv c on c.coinv = d.coinv 
where 
    c.itemnumber = '12345678' 

注：我用的字段名coinv，而不是您在查询中使用的coinvid，因为这是您在表结构中指定的内容。