Question

我已经开发了一个查询来处理报告数据。我只需要从所选月份的历史记录表中获得一条记录。

例如：这些是4辆车。车辆“ 1”在以下日期和价格上于2018年11月进行了四次修改：

1). 05 November 2018 with price 1000
2). 15 November 2018 with price 5000
3). 25 November 2018 with price 8000

现在，我想要最后修改日期（11月25日）上的唯一一条记录。

我开发了一个数据库标量函数，并在join子句中使用了该函数，该子句可完美地处理较少的数据。现在，我们有了一些记录（历史记录表中的记录不只是100条），并且该报告存在速度/性能问题。我创建了索引并删除了子查询，但仍然没有太大帮助。

请参阅我尝试过的脚本：

declare @pIntFranchiseId int = 16179;
declare @pDtFrom date = '2018-12-01';
declare @pDtTo date = '2018-12-28'; 


SELECT ba.[Id],BKAgrHistory.[BookingStart],BKAgrHistory.[BookingEnd],BKAgrHistory.[StartTime],BKAgrHistory.[EndTime]
      ,ba.[FranchiseId],BKAgrHistory.[FleetId],[BKRenterId],[IsReportGenerated],[StepsCompleted]
      ,ba.[BookingId],ba.[ReservationId],ba.[RentalAgreementId],[VehicleUsedFor],[OperatorLicence]
      ,[ClearanceCode],[ExcessAmount],[ClearanceCodeAdditionalDriv],[ExcessAmountAdditionalDriv],[IsClearanceVerified]
      ,[BKDiscount],BKAgrHistory.[AgreementStatus],[IsTravelingOutsideUk],[OtherCountries],[RentalType],[RenterType],[RenterCompanyType]
      ,[IsVehicleDelivered],[IsReturnedOnSameAddress],[PickUpAddress],[ReturnAddress],[OtherReturnAddress],[TariffId]
      ,[SpecialRateId],[IsChargeShortWeekend],[IsChargeLongWeekend],[ChargeHalfDay],[IsDamageProvided],[IsRenterAgreement]
      ,[BKIsOwnInsurance],[ExpectedMileage],BKAgrHistory.[TotalHireCharge],[BKFreeMiles],[BKExpensePerMile],[BKCollisionDamage],[BKDamage]
      ,[BKTheft],[BKOverHeight],[BKBookingNotes],[BKFleetCurrentMileage],[BKMileageOut],[BKMileageIn],[BKDamageOut],[BKDamageIn],[Condition]
      ,[AppliedRates],[Paid],[OnceInvoiced],[InterimInvoiceCount],[PBNumber],[Excess],[StatusId],[CreatedOn],[ModifiedOn],BKAgrHistory.[BookingDays]
      ,[VATPercentage],[BkOpeningHrsSurcharge],[DrivenMileage],[ParentRAId],[NetTotal],[VatTotal],[GrossTotal],[GrandInsurableRevenue]
      ,[GrandTotalWithoutExtra],[GrandInsurableRevWithoutExtra],[TariffNetPrice],[OnceMailed],[LastBookingEnd],[LastEndTime],[BkOpeningHrsSurchargeNet]
      ,[BkOpeningHrsSurchargeVat],BKAgrHistory.[DailyHireCharge],[BkNetExtraDrivenMilesExcess],[BkExtraDrivenMilesExcessVAT],[BkTotalExtraDrivenMilesExcess],[ExcessMilesDays]
      ,[BkWebWeekendSurcharge],BKAgrHistory.[InsertedUserId],BKAgrHistory.[UpdateUserId],BKAgrHistory.[InsertedDate],BKAgrHistory.[UpdatedDate],BKAgrHistory.[InsertedUserName],BKAgrHistory.[UpdatedUserName],
      [SecurityDeposit],[SecurityDepositRuleId]
  FROM [dbo].[BookingAgreements] ba
join BookingAgreementAmountHistory BKAgrHistory on BKAgrHistory.Id = dbo.[GetAgreementAmtHistoryId](@pIntFranchiseId,ba.Id,@pDtFrom,@pDtTo)
     where  
     (
         DATEADD(day, DATEDIFF(day, 0,BKAgrHistory.BookingStart), 0)  <= DATEADD(day, DATEDIFF(day, 0, @pDtFrom), 0)  OR
         DATEADD(day, DATEDIFF(day, 0,BKAgrHistory.BookingEnd), 0)  <= DATEADD(day, DATEDIFF(day, 0, @pDtFrom), 0)
     )           
     and ba.FranchiseId=@pIntFranchiseId and StatusId=1
     and ISNULL(BKAgrHistory.AgreementStatus,0) not in (0,2,6,7)
     and BKAgrHistory.FleetId in (
         select f.Id from Fleets f
          join FleetsHistory fleetHis on fleetHis.Id = dbo.[GetVehicleHistoryById](@pIntFranchiseId,BKAgrHistory.FleetId,@pDtFrom,@pDtTo)
         where fleetHis.GhostVehicle = 0 and fleetHis.CoreFleet = 1 and isnull(fleetHis.StatusId,0) in (1,4) and 
         f.Franchise_Id=@pIntFranchiseId and DATEADD(day, DATEDIFF(day, 0,  fleetHis.PurchaseDate), 0) <=  DATEADD(day, DATEDIFF(day, 0, @pDtTo), 0));

    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    CREATE FUNCTION [dbo].[GetVehicleHistoryById](@franchiseId int = NULL,@fleetId int = NULL, @fromDate Date = NULL, @toDate Date = NULL)
    RETURNS  int

    AS BEGIN

    Declare @returnId int = 0;
    Select top 1 @returnId = isnull(Id,0) from FleetsHistory
    where TransactionDate =
    (Select max(TransactionDate)
    from FleetsHistory  fh
    where   fh.Franchise_Id = @franchiseId and fh.Fleet_Id = @fleetId                                       
    --group by AgreementId
    and (DATEADD(day, DATEDIFF(day, 0, TransactionDate),0)) <= DATEADD(day, DATEDIFF(day, 0, @toDate),0))
    order by Id desc;

    Return @returnId;

    END

        SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    ALTER FUNCTION [dbo].[GetAgreementAmtHistoryId](@franchiseId int = NULL,@agreementId int = NULL, @fromDate Date = NULL, @toDate Date = NULL)
    RETURNS  int

    AS BEGIN

    Declare @returnId int = 0;
    Select top 1 @returnId = isnull(Id,0) from BookingAgreementAmountHistory
    where TransactionDate =
    (Select max(TransactionDate)
    from BookingAgreementAmountHistory  
    where   FranchiseId = @franchiseId and AgreementId = @agreementId                                       
    --group by AgreementId
    and (DATEADD(day, DATEDIFF(day, 0, TransactionDate),0)) <= DATEADD(day, DATEDIFF(day, 0, @toDate),0))
    order by Id desc;

    Return @returnId;

    END

Answer 1

无论其他函数可以做什么，它们都不能提高SQL查询的性能。

我建议将apply与正确的参数一起使用。鉴于问题中查询的泛滥，样本数据的缺乏和期望的结果以及简单问题与实际查询之间的脱节，很难看到您真正想要的是什么。但想法是：

select ba.*, baah.*
from [dbo].[BookingAgreements] ba outer apply
     (select top (1) baah.*
      from BookingAgreementAmountHistory baah
      where baah.Id = ba.FranchiseId and
            baah.AgreementStatus not in (2, 6, 7) and -- this takes care of NULL values 
            baah.<date> >= @pDtFrom and
            baah.<date> <= @pDtTo
       order by baah.<date> desc
      ) baah
where ba.FranchiseId = @pIntFranchiseId;

<date>是您在问题开头提到的修改日期。目前还不清楚这实际上指的是什么日期。

如何提高join子句中使用的标量值函数的性能？

1 个答案: