[英]sql server subquery join error
I want to update GroupID column of massemail_emailmaster and set it to the value as it is stored on massemail_groupmaster. 我想更新massemail_emailmaster的GroupID列,并将其设置为存储在massemail_groupmaster上的值。 Both table has GroupName column which is I have used to join in the subquery. 这两个表都有GroupName列,这是我用来加入子查询的列。 But the following query is giving me error. 但是以下查询给了我错误。 Error message is incorrect syntax near a3. 错误消息是a3附近的语法不正确。 I don't understand the mistake in syntax here. 我不明白语法错误。 Please help. 请帮忙。
UPDATE [dbo].[massmail_emailmaster] a3
set a3.GroupId =
(select TOP 1 a1.GroupID from [dbo].[massmail_groupmaster] a1
join [dbo].[massmail_emailmaster] a2
on a1.[groupname] = a2.[groupname]
where a3.[GroupName]=a2.[GroupName])
DDL of table [dbo]. [massmail_emailmaster]
表[dbo]. [massmail_emailmaster]
DDL [dbo]. [massmail_emailmaster]
[dbo]. [massmail_emailmaster]
(ClientID, varchar(50)),
(uid, int)
(Name, varchar(100))
(GroupName, varchar(100))
(Email, varchar(100))
GroupId, int)
DDL of table 表的DDL
[dbo]. [massmail_groupmaster]
(Clientid, varchar(50))
,(uid, int)
,(groupname, varchar(100))
(GroupId,int))
You can use the alias in the update
when you later define it in the from
clause. 以后在from
子句中定义别名时,可以在update
使用别名。 (This is a "perverse" situation where the alias is defined after its first use.) (这是一种“错误”的情况,其中别名是在其首次使用后定义的。)
UPDATE a3
set GroupId = (select TOP 1 a1.GroupID
from [dbo].[massmail_groupmaster] a1
where a1.[groupname] = a3.[groupname]
)
FROM [dbo].[massmail_emailmaster] a3;
UPDATE a2
SET a2.GroupId = (SELECT TOP 1 a.GroupID
FROM [dbo].[massmail_groupmaster] a
INNER JOIN [dbo].[massmail_emailmaster] b
ON a.[groupname] = b.[groupname]
)
FROM [dbo].[massmail_emailmaster] a2
WHERE a.[groupname] = a2.[groupname]
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