TSQL条件连接第二个表中的值

Question

我想在两个表上进行条件连接，并希望在第二个表中以最高状态加入。状态值为Assigned，Booked，Delivery和Closed。

SELECT 
    CPC.CpcID, StatusFlow = CPC.Status, Orders.CarModel, EnquiryLog.EnquiryStatus
FROM 
    CPC
INNER JOIN 
    Orders ON CPC.CpcID = Orders.CpcID    
INNER JOIN 
    EnquiryLog ON CPC.CpcID = EnquiryLog.CpcID
WHERE 
    CPC.CpcID = '24092015/12'

因此，在这种情况下，它应该只显示一行EnquiryStatus＆＃39; Delivery＆＃39;但根据我的查询结果是：

SQL查询输出：

Answer 1

如果我以正确的方式得到它：

SELECT CPC.CpcID, StatusFlow = CPC.Status, Orders.CarModel, ca.EnquiryStatus
FROM CPC
INNER JOIN Orders ON CPC.CpcID = Orders.CpcID    
CROSS APPLY(SELECT TOP 1 * FROM EnquiryLog WHERE CPC.CpcID = EnquiryLog.CpcID
            ORDER BY CASE EnquiryStatus
                          WHEN 'CLOSED' THEN 1
                          WHEN 'DELIVERY' THEN 2
                          WHEN 'BOOKED' THEN 3
                          WHEN 'ASSIGNED' THEN 4 END) ca
WHERE CPC.CpcID='24092015/12'