Question

在从自身更新同一个表时，如何对表进行别名？

我的查询：

update accounts set adusername = x.adusername 
from Accounts x
where x.AccountName = accounts.rev and x.ok>10 and accounts.ok in (0,1,2,3) 
and x.ADUserName is not null and accounts.ADUserName is null

错误

Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.rev" could not be bound.
Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.ok" could not be bound.
Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.ok" could not be bound.
Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.ok" could not be bound.
Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.ok" could not be bound.
Msg 4104, Level 16, State 1, Line 9
The multi-part identifier "accounts.ADUserName" could not be bound.

Answer 1

这个怎么样：

UPDATE a
SET a.adusername = x.adusername 
FROM Accounts x
INNER JOIN Accounts a ON x.AccountName = a.rev
WHERE x.ok>10
    AND a.ok in (0,1,2,3) 
    AND x.ADUserName is not null
    AND a.ADUserName is null

Answer 2

这仅适用于子查询或联接：

UPDATE accounts SET adusername = 'ABC'
FROM Accounts AS x
WHERE x.ID IN (SELECT ID FROM Accounts WHERE Accounts.Username = 'XYZ') AND x.OK in (0,1,2,3)

或

UPDATE accounts SET adusername = x.adusername 
FROM Accounts
  JOIN Accounts AS x ON Accounts.ID = x.ID
WHERE x.Username = 'XYZ' AND Accounts.OK in (0,1,2,3)

应该做的。

如何在从自身更新同一个表的同时对表进行别名？

2 个答案: