更新表基於標準的連接表

Question

我有以下

客戶1-多CustomerAddresses

客戶1-多CustomerCalls

我想基於在一列中的值更新CustomerAddresses CustomerCalls。像下面這樣：

Update CustomerAddresses 
Set CustomerAddresses.PostCode = 'xxx' 
Where CustomerCalls.CallType = 'x' 

Answer 1

您可以在更新語句中使用from條款，讓您也可以使用連接。像這樣的東西應該做的伎倆（雖然我不得不猜測列名...）

UPDATE CustomerAddresses 
SET CustomerAddresses.PostCode = 'xxx' 
FROM CustomerAddresses 
INNER JOIN Customers ON Customers.Address = CustomerAddresses.AddressId 
INNER JOIN CustomerCalls ON Customers.Calls = CustomerCalls.CallId 
WHERE CustomerCalls.CallType = 'x'