Question

请考虑以下代码段：

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 SKUID，这需要很多时间来执行语句。您能建议我如何改善此查询吗？

Answer 1

您可以使用EXISTS()

将SKU放入临时表

和

WHERE  vbs.SKUID IN (Here i have almost 12000 SKU)

更改为

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

Answer 2

您也可以使用Inner Join, EXISTS代替IN。请参考EXISTS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

请在下面查询INNER JOIN：

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

T-SQL中是否有“ IN”语句的替代方法？

2 个答案: