更新操作期间的多个内部联接

Question

Access中的更新操作期间是否可以执行双重内部联接？

下面的代码犯规”工作对我来说：

UPDATE [TableA] 

INNER JOIN [TableB] ON [TableB].Field1= [TableA].Field1, 
INNER JOIN [TableC] ON [TableC].Field2 = [TableB].Field2 

Set 
[TableA].Field3 = 'Test' 

where [TableC].Field4 = 0 

Answer 1

是的，它是可能的。

对于SQL SERVER：

UPDATE A 
Set 
A.Field3 = 'Test' 
FROM [TableA] A 
INNER JOIN [TableB] B ON B.Field1 = A.Field1 
INNER JOIN [TableC] C ON C.Field2 = B.Field2 
where C.Field4 = 0 

对于MS ACCESS

UPDATE ([TableA] 
INNER JOIN [TableB] ON [TableB].Field1 = [TableA].Field1) 
INNER JOIN [TableC] ON [TableC].Field2 = [TableB].Field2 
Set [TableA].Field3 = 'Test' 
where [TableC].Field4 = 0 

Answer 2

常规语法多个连接update操作如下：

UPDATE T1 
[INNER JOIN | LEFT JOIN] T2 ON T1.C1 = T2.C1 
[INNER JOIN | LEFT JOIN] T3 ON T2.C2 = T3.C2 
SET T1.C2 = T2.C2 
WHERE condition