优化SQL查询
我有一个需要很长时间才能执行的查询。我尝试过在每个表上使用索引,但仍然需要很长时间。是否有其他方法优化此查询优化SQL查询,sql,sql-server-2008,query-optimization,Sql,Sql Server 2008,Query Optimization,我有一个需要很长时间才能执行的查询。我尝试过在每个表上使用索引,但仍然需要很长时间。是否有其他方法优化此查询 SELECT tblDLM.Phone FROM (SELECT Table1.Phone, Count(Table_1.T1ID) AS CountOfT1ID FROM Table_1 INNER JOIN Table_2 ON Table_1.Subscriptio
SELECT tblDLM.Phone
FROM (SELECT Table1.Phone,
Count(Table_1.T1ID) AS CountOfT1ID
FROM Table_1
INNER JOIN Table_2
ON Table_1.SubscriptionID = Table_2.SubscriptionID
WHERE ( ( Table_1.MsgType ) = 'coupon' )
AND (( ( Table_1.Phone ) IN (SELECT DISTINCT Table_3.Phone
FROM Table_3
WHERE Table_3.DeliveryStatus <> 0
AND Table1.Phone = Table_3.Phone)
AND CampaignID <> Cast(@intCampaignIDTemp AS NVARCHAR(50)) ))
GROUP BY Table_1.Phone,
Table_2.MasterServiceID
HAVING Table_2.MasterServiceID = 121) tblDLM
WHERE CountOfT1ID >= 3
谢谢。试试这个:
编辑:
您真的需要表1.Phone、表2.MasterServiceID分组吗
尝试将Table_1.Phone替换为。。。。与表1上的另一个连接。Phone=表3.Phone
DECLARE @nvarcharCampaignIDTemp NVARCHAR(50);
SET @nvarcharCampaignIDTemp = Cast(@intCampaignIDTemp AS NVARCHAR(50));
SELECT
Table1.Phone
FROM
Table_1
INNER JOIN Table_2
ON Table_1.SubscriptionID = Table_2.SubscriptionID
INNER JOIN Table_3
ON Table1.Phone = Table_3.Phone
WHERE
Table_1.MsgType = 'coupon'
AND Table_2.MasterServiceID = 121
AND CampaignID <> @nvarcharCampaignIDTemp
AND Table_3.DeliveryStatus <> 0
AND Count(DISTINCT Table_1.T1ID) >= 3