Sql server T-SQL中的“IN”语句是否有其他选择？

考虑以下代码片段：

SELECT 
    vbs.SKUID, SKUName, SUM(vbs.Quantity) AS Qty
FROM   
    BatchStocks AS vbs
WHERE  
    vbs.SKUID IN (Here i have almost 12000 SKU)
    AND vbs.StoreID IN (%q)
    AND vbs.StockType = %n
GROUP BY
    vbs.SKUID, vbs.SKUName

在where条件下，我有将近12000个SKUID，执行语句需要很多时间。您能建议我如何改进此查询吗？

您可以使用EXISTS

将SKU放入临时表中

及

改为

WHERE  EXISTS
       (
           SELECT *
           FROM   #TEMP x
           WHERE  x.SKUID  = vbs.SKUID 
       )

您可以使用EXISTS

将SKU放入临时表中

及

改为

WHERE  EXISTS
       (
           SELECT *
           FROM   #TEMP x
           WHERE  x.SKUID  = vbs.SKUID 
       )

您还可以使用内部联接EXISTS而不是IN。 请参阅以下查询：

SELECT 
    vbs.SKUID, SKUName, SUM(vbs.Quantity) AS Qty
FROM   
    BatchStocks AS vbs
WHERE  
    EXISTS ( select 1 from #TEMPTABLE t on t.SKUID = vbs.SKUID)
    AND vbs.StoreID IN (%q)
    AND vbs.StockType = %n
GROUP BY
    vbs.SKUID, vbs.SKUName

有关内部联接，请参阅以下查询：

SELECT 
    vbs.SKUID, SKUName, SUM(vbs.Quantity) AS Qty
FROM   
    BatchStocks AS vbs
    INNER JOIN #TEMPTABLE t on t.SKUID = vbs.SKUID
WHERE  vbs.StoreID IN (%q)
    AND vbs.StockType = %n
GROUP BY
    vbs.SKUID, vbs.SKUName

您还可以使用内部联接EXISTS而不是IN。 请参阅以下查询：

SELECT 
    vbs.SKUID, SKUName, SUM(vbs.Quantity) AS Qty
FROM   
    BatchStocks AS vbs
WHERE  
    EXISTS ( select 1 from #TEMPTABLE t on t.SKUID = vbs.SKUID)
    AND vbs.StoreID IN (%q)
    AND vbs.StockType = %n
GROUP BY
    vbs.SKUID, vbs.SKUName

有关内部联接，请参阅以下查询：

SELECT 
    vbs.SKUID, SKUName, SUM(vbs.Quantity) AS Qty
FROM   
    BatchStocks AS vbs
    INNER JOIN #TEMPTABLE t on t.SKUID = vbs.SKUID
WHERE  vbs.StoreID IN (%q)
    AND vbs.StockType = %n
GROUP BY
    vbs.SKUID, vbs.SKUName

---

将这12000个SKUID放入他们自己的表中，然后只做一个内部联接…将这12000个SKUID放入他们自己的表中，然后只做一个内部联接…小心联接，如果有任何重复，则会返回两行或更多行，而本应是一行。小心联接，如果存在任何重复项，则将为本应为单个的行返回2行或更多行。