Sql server 2008 如何使此查询运行得更快？

我有下面的查询运行非常慢，我感谢您的评论，以帮助我加快运行速度。我没有修改任何数据库的权限。我有两个数据库，1和2

数据库1包含呼叫者信息，包括CallMemberID（可能小于或大于14位，可能包括逗号）、车辆属性（颜色、制造商、型号、状态等）

我删除了逗号，然后使用：left（CallMemberID_mod，14）作为'MemberId'将CallMemberID的前14位数字作为MemberId

我还将车辆属性取消为“车辆”，以便稍后使用：Count（distinct（b.vehicle））作为“每个成员的车辆计数”查找每个成员的不同车辆的数量ID 数据库2包含有关已拨打投诉电话的成员的信息。它包括clubcode、CallMemberID和dait（实际上是成员进行呼叫的日期）。 我使用：COUNT（*）作为“ComplaintsPerMemberId”组按MemberID查找每个成员的投诉数量 我还使用：AvgCallTimes找到了每个成员id的平均通话间隔天数：

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试图帮助您，但在不使用实际数据运行或不查看执行计划的情况下，无法说明性能提高了多少

Declare @MemberVehicle Table
(
     CallMemberID       Int
    ,MemberID           Varchar(500)
    ,Vehicle            Varchar(500)
    ,ID                 Int
)

WITH CallTimesOrdered (num, id, calldate) AS 
(
    SELECT   ROW_NUMBER() OVER (PARTITION BY clubcode, CallMemberID ORDER BY dait DESC) AS RowNumber
            ,CallMemberID
            ,dait
    FROM    database1
)
,AvgCallTimes (id, timespan) AS 
(
    SELECT   CurrentDate.id
            ,DATEDIFF(d, CurrentDate.calldate, PriorDate.calldate)
    FROM    CallTimesOrdered CurrentDate
            INNER JOIN CallTimesOrdered PriorDate ON PriorDate.num = CurrentDate.num - 1 AND PriorDate.id = CurrentDate.id
)

Insert Into @MemberVehicle(CallMemberID,MemberID,Vehicle,ID)
Select   a.CallMemberID
        ,a.MemberID
        ,ISNULL(a.VehicleColor,'') + ' ' + ISNULL(a.VehicleManufactureYearDate, '') + ' ' + ISNULL(a.VehicleLicenseStateCode, '') + ' '
            + ISNULL(a.VehicleManufactureNumber, '') +' '
            + ISNULL(a.VehicleModelNumber, '') 
            AS Vehicle
        ,a.ID
From    (
            SELECT   Distinct
                     c.CallMemberID
                    ,Left(LTRIM(REPLACE(CallMemberID, ',', '')), 14) AS MemberID
                    ,c.VehicleColor
                    ,c.VehicleManufactureYearDate
                    ,c.VehicleLicenseStateCode
                    ,c.VehicleManufactureNumber
                    ,c.VehicleModelNumber
                    ,c.ID
            FROM    database1 As c With (Nolock)
            Where   Len(LTRIM(REPLACE(CallMemberID, ',', ''))) >= 14
        ) As a

SELECT   b.MemberID
        ,AVG(d.timespan) AS AverageTimeBetweenCalls
        ,Count(b.Vehicle) AS VehicleCountPerMember
        ,ISNULL(vic.ComplaintsPerMemberId, 0) AS NumberOfComplaintsPerMember
FROM    @MemberVehicle As b
        LEFT OUTER JOIN 
        (
            SELECT   tab.MemberId
                    ,tab.ComplaintsPerMemberId
            FROM    (
                        SELECT   clubcode
                                ,MemberId
                                ,COUNT(*) AS ComplaintsPerMemberId
                        FROM    database2 With (Nolock)
                        GROUP BY MemberId
                                ,clubcode
                    ) tab
        ) vic On vic.MemberId = b.MemberId
        LEFT JOIN 
        (
            SELECT   Id
                    ,timespan
            FROM    AvgCallTimes With (Nolock)
        ) d ON d.ID = b.CallMemberID
GROUP BY b.MemberID
        ,vic.ComplaintsPerMemberId
ORDER BY b.MemberID

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您可以显示查询执行计划吗？没有这些，任何人都几乎不可能帮助您。（1）我想建议，删除*并获取输出中真正使用的许多属性。这么多地方，你都用了“*”。（2） 为什么不在内部查询时使用不同的车辆。那你就算了。尝试使用CTE@taking count of ComplaintsPerMemberId。如果vehicle select结果小于5000行，则尝试将其设为@table变量，因为它驻留在内存中并提供快速输出。

Declare @MemberVehicle Table
(
     CallMemberID       Int
    ,MemberID           Varchar(500)
    ,Vehicle            Varchar(500)
    ,ID                 Int
)

WITH CallTimesOrdered (num, id, calldate) AS 
(
    SELECT   ROW_NUMBER() OVER (PARTITION BY clubcode, CallMemberID ORDER BY dait DESC) AS RowNumber
            ,CallMemberID
            ,dait
    FROM    database1
)
,AvgCallTimes (id, timespan) AS 
(
    SELECT   CurrentDate.id
            ,DATEDIFF(d, CurrentDate.calldate, PriorDate.calldate)
    FROM    CallTimesOrdered CurrentDate
            INNER JOIN CallTimesOrdered PriorDate ON PriorDate.num = CurrentDate.num - 1 AND PriorDate.id = CurrentDate.id
)

Insert Into @MemberVehicle(CallMemberID,MemberID,Vehicle,ID)
Select   a.CallMemberID
        ,a.MemberID
        ,ISNULL(a.VehicleColor,'') + ' ' + ISNULL(a.VehicleManufactureYearDate, '') + ' ' + ISNULL(a.VehicleLicenseStateCode, '') + ' '
            + ISNULL(a.VehicleManufactureNumber, '') +' '
            + ISNULL(a.VehicleModelNumber, '') 
            AS Vehicle
        ,a.ID
From    (
            SELECT   Distinct
                     c.CallMemberID
                    ,Left(LTRIM(REPLACE(CallMemberID, ',', '')), 14) AS MemberID
                    ,c.VehicleColor
                    ,c.VehicleManufactureYearDate
                    ,c.VehicleLicenseStateCode
                    ,c.VehicleManufactureNumber
                    ,c.VehicleModelNumber
                    ,c.ID
            FROM    database1 As c With (Nolock)
            Where   Len(LTRIM(REPLACE(CallMemberID, ',', ''))) >= 14
        ) As a

SELECT   b.MemberID
        ,AVG(d.timespan) AS AverageTimeBetweenCalls
        ,Count(b.Vehicle) AS VehicleCountPerMember
        ,ISNULL(vic.ComplaintsPerMemberId, 0) AS NumberOfComplaintsPerMember
FROM    @MemberVehicle As b
        LEFT OUTER JOIN 
        (
            SELECT   tab.MemberId
                    ,tab.ComplaintsPerMemberId
            FROM    (
                        SELECT   clubcode
                                ,MemberId
                                ,COUNT(*) AS ComplaintsPerMemberId
                        FROM    database2 With (Nolock)
                        GROUP BY MemberId
                                ,clubcode
                    ) tab
        ) vic On vic.MemberId = b.MemberId
        LEFT JOIN 
        (
            SELECT   Id
                    ,timespan
            FROM    AvgCallTimes With (Nolock)
        ) d ON d.ID = b.CallMemberID
GROUP BY b.MemberID
        ,vic.ComplaintsPerMemberId
ORDER BY b.MemberID