Question

我有一组表，我要加入这些表以创建一个记录集，然后对该集合运行附加选择以检索一些记录。代码中的查询已在视图中用作CTE。

仅检查子查询时，它的运行速度非常快，如0.01-0.02秒。如果使用临时表检索记录，则同样适用。当我计划在视图中使用它时，临时表解决方案超出了范围。常规查询的运行时间为37-50分钟。

SELECT 
 CallDate
,MediaChannel
,SubCategory
,Vendor
,BusinessVertical
,SUM(NumberOfLeads) AS NumberOfLeads
,CASE 
    WHEN SUM([CostPerLead]) <> 0
        THEN SUM([CostPerLead])
    ELSE NULL
    END AS Cost
,[CostPerLead]
,SourceName
,ParentLeadSource
,IsBillable
,dvce_type

FROM (
SELECT [PhoneLabel]
    ,[DialogTechCallId] = cd.DialogTechCallId
    ,[LeadId] = c.LeadId
    ,[CostPerLead] = CAST(cpl.cost AS INT)
    ,[SourceName] = bt.LeadCompany
    ,[ParentLeadSource] = ftlc.fruit
    ,[DialogTechPhoneNumber] = cd.CalledNumber
    ,[CallDate] = CAST(cd.[CallDateTime] AS DATE)
    ,[CallType] = cd.CallType
    ,[TalkTime] = cd.[TalkTimeMinutes]
    ,[TalkTimeSeconds] = CASE 
        WHEN ISNUMERIC(cd.[TalkTimeMinutes]) = 1
            THEN CAST(cd.[TalkTimeMinutes] AS DECIMAL(10, 2)) * 60
        ELSE 0
        END
    ,[TimeToQualify] = bt.Billabletime
    ,[IsBillable] = CASE 
        WHEN ISNUMERIC(cd.[TalkTimeMinutes]) = 1
            THEN CASE 
                    WHEN CAST(cd.[TalkTimeMinutes] AS DECIMAL(10, 2)) * 60 
    >= CAST(bt.Billabletime AS INT)
                        THEN 1
                    WHEN bt.Billabletime = 900
                        THEN 1
                    ELSE 0
                    END
        ELSE 0
        END
    ,[MediaChannel] = ftlc.channel2
    ,[SubCategory] = ftlc.sub
    ,[Vendor] = ftlc.vendor
    ,[BusinessVertical] = ftlc.business_vertical
    ,[NumberOfLeads] = 1
    ,[dvce_type] = ftlc.dvce_type

    FROM [dbo].[Abc] d WITH (NOLOCK)

    LEFT JOIN [dt].[cde] cd WITH (NOLOCK) ON d.FullDate = 
    CAST(cd.CallDateTime AS DATE)

    LEFT JOIN [dt].[efg] c WITH (NOLOCK) ON cd.DialogtechCallId = 
    c.DialogTechCallid

    INNER JOIN [dt].[hij] m WITH (NOLOCK) ON cd.CallerId = 
    m.DialogTechPhoneNumber

    INNER JOIN [dt].[klm] bt WITH (NOLOCK) ON m.LeadSourceInfoId = 
    bt.LeadSourceId AND cd.[CallDateTime] BETWEEN bt.[StartDateTime]
    AND ISNULL(bt.[EndDateTime], GETDATE())

    INNER JOIN [dbo].[jkl] ftlc WITH (NOLOCK) ON bt.ParentLeadSource = 
    ftlc.fruit

    INNER JOIN dbo.xyz cpl WITH (NOLOCK) ON ftlc.lead_company =        
    cpl.lead_company AND cd.[CallDateTime] >= cpl.[start_date]
    AND cd.[CallDateTime] <= ISNULL(cpl.[end_date], GETDATE())

    WHERE CAST(cd.[CallDateTime] AS DATE) >= '2018-08-01'
    AND CASE WHEN ISNUMERIC(cd.[TalkTimeMinutes]) = 1
            THEN CASE 
                    WHEN CAST(cd.[TalkTimeMinutes] AS DECIMAL(10, 2)) * 60 
    >= CAST(bt.Billabletime AS INT)
                        THEN 1
                    WHEN bt.Billabletime = 900
                        THEN 1
                    ELSE 0
                    END
        ELSE 0
        END = 1
   ) sub

 GROUP BY 
 CallDate
,MediaChannel
,SubCategory
,Vendor
,BusinessVertical
,SourceName
,ParentLeadSource
,IsBillable
,dvce_type
,CostPerLead;

----该查询正在视图中使用，因此需要解决子查询问题并减少运行时间。

Answer 1

您的子查询中有一些未在外部查询中使用的数据。您的某些联接还会将NULL值引入NULL值，这会降低性能。

在不知道您的表结构或函数，也没有任何实际数据的情况下，我想出了以下简化的查询版本。它会从子查询中删除未使用的列，随后无用的连接，简化的App_Resources/Android/src/main/AndroidManifest.xml语句以及从主查询中删除CASE，因为您正在对此进行汇总。

CostPerLead

SQL子查询的运行速度非常快，但是在select中使用时非常慢

1 个答案: