如何在SQL中将表的两列与其他表的两列连接

Question

我在#temp表上有2列SKU_new和order_ID与订单表的SKU和ID列匹配，我正在使用内部 联接 ，但它会继续执行并且不会显示任何结果。

我的查询是

SELECT t.SKU_new, t.ID_Order
INTO #caseone
FROM dbo.Order_No AS n JOIN
     dbo.Orders AS o
     ON n.Order_No = o.Order_No JOIN
     #Temp AS t
     ON (t.ID_Order = o.ID or t.SKU_new = o.SKU);

Answer 1

阅读问题时，您说“ 2列SKU_new 和 order_ID”

基于此，您是否不会在Join中使用AND而不是OR？

SELECT  t.SKU_new
,       t.ID_Order
INTO    #caseone
FROM    dbo.Order_No AS n
        JOIN dbo.Orders AS o ON n.Order_No = o.Order_No
        JOIN #Temp AS t ON t.ID_Order = o.ID
                           AND t.SKU_new = o.SKU;

Answer 2

在两种情况下，查询继续执行

一种是当表上有未提交的事务时尝试

 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
        SELECT t.SKU_new, t.ID_Order
        INTO #caseone
        FROM dbo.Order_No AS n JOIN
       dbo.Orders AS o
       ON n.Order_No = o.Order_No JOIN
       #Temp AS t
       ON (t.ID_Order = o.ID or t.SKU_new = o.SKU)

如果是方案2，则可能有那么多具有错误索引的记录。 要检查是否正在获取记录，请在选择中尝试“顶部”

        SELECT Top 1  t.SKU_new, t.ID_Order
        INTO #caseone
        FROM dbo.Order_No AS n JOIN
       dbo.Orders AS o
       ON n.Order_No = o.Order_No JOIN
       #Temp AS t
       ON (t.ID_Order = o.ID or t.SKU_new = o.SKU

Answer 3

我认为这可能是您想要的。

SELECT t.SKU_new
, t.ID_Order
INTO #caseone
FROM #temp t 
JOIN dbo.orders o 
    ON t.ID_Order = o.ID 
    AND t.SKU_new = o.SKU
JOIN dbo.Order_No n 
    ON n.Order_No = o.Order_No