SQL查询非常昂贵

我在SQL Server中有一个查询，它搜索可用的服务提供商来预订约会，如下所示：

我有一个与服务表相关的多对一服务提供商 此外，服务提供商还与员工表中的多对一相关 服务表与StaffMemberService表中的staffMember多对多相关 我有许多与staffMember表相关的任命详情表 您可以在此图中看到详细信息：

查询哪些服务有开放的时间段是非常昂贵的

--select * from ServiceProvider where Id > = 636 and CityId = 4 
DECLARE @longx      NVARCHAR(20);
DECLARE @laty       NVARCHAR(20);
DECLARE @userCityId INT;
DECLARE @userLocation GEOMETRY;
Declare @serviceName  NVARCHAR(50);
declare @startDate AS DATE;
declare @endDate   AS DATE;

SET @longx = '24.72977896594770';
SET @laty = '46.82470379239910';
SET @userCityId = 4;
SET @serviceName = '%hair%'
SET @userLocation = geometry::STPointFromText('POINT(' + @laty + ' ' + @longx + ')',0);
SET @startDate = '2019-06-01';
SET @endDate = '2019-06-05';

DECLARE @compareParts AS INT;
SET @compareParts = DATEDIFF(DAY, @startDate, @endDate) * 40 ;

-- get all services like serviceName
-- find out which SP offer them
-- find out if sp has availble time in the specific dates 
WITH Serv AS
(
    SELECT s.* 
    FROM Services s 
    INNER JOIN ServiceProvider sp ON sp.Id = s.ServiceProviderId
    WHERE sp.CityId = @userCityId 
      AND s.Name LIKE @serviceName 
),
StaffServices AS
(
     SELECT s.* 
     FROM StaffMembers s 
     INNER JOIN StaffMemberService sms ON sms.StaffMemberId = s.Id
     INNER JOIN Serv ON sms.ServiceId = Serv.Id
),
StaffMemberAppointment AS
(
    SELECT ad.StaffMemberId, ad.Id, ad.Duration,a.ServiceProviderId 
    FROM AppointmentDetails ad 
    INNER JOIN Appointments a ON ad.AppointmentId = a.Id
    INNER JOIN ServiceProvider sp ON sp.Id = a.ServiceProviderId
    INNER JOIN StaffMemberService sms ON sms.StaffMemberId = ad.StaffMemberId
    INNER JOIN Serv ON Serv.Id = sms.ServiceId
    WHERE a.StartDt BETWEEN @startDate AND @endDate
),
appointmentParts AS
(
    SELECT 
        sa.StaffMemberId, sa.ServiceProviderId,  
        SUM(Datepart(minute, sa.duration) + DATEPART(hour, sa.duration) * 60 ) /15 AS appointmentsparts
    FROM
        StaffMemberAppointment sa
    GROUP BY
        sa.StaffMemberId, sa.ServiceProviderId
)
SELECT 
    sm.*,
    ap.appointmentsparts 
FROM
    StaffMembers sm
INNER JOIN
    StaffServices ss ON ss.Id = sm.Id
LEFT JOIN 
    appointmentParts ap ON sm.Id = ap.StaffMemberId

我的基本想法是寻找服务的名称，比如提供的名称，然后我试图找到谁是可以提供服务的员工，并检查在特定日期范围内预订了多少预约时间，然后找到提供服务的服务提供商

IO统计a

(5 row(s) affected)
Table 'Appointments'. Scan count 0, logical reads 12, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'AppointmentDetails'. Scan count 5, logical reads 16, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'ServiceProvider'. Scan count 0, logical reads 20, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'StaffMemberService'. Scan count 3, logical reads 28, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Services'. Scan count 6, logical reads 18, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'StaffMembers'. Scan count 0, logical reads 10, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

(1 row(s) affected)

时间间隔是15分钟。所以30分钟的预约是两个时段。

---

我找不到简化此查询的方法，有人能帮忙吗。

如果您放弃CTE并使用带有外部应用程序的单一连接级别来计算约会时间段的数量，您会得到什么样的执行计划

SELECT  sm.Id, sm.Name, sm.ServiceProviderId, sp.Name, appt.AppointmentSlots
FROM    Services svc 
        INNER JOIN ServiceProvider sp ON sp.Id = svc.ServiceProviderId
        INNER JOIN StaffMemberService sms ON sms.ServiceId = svc.Id
        INNER JOIN StaffMembers sm ON sm.Id = sms.StaffMemberId
        OUTER APPLY 
        (
            SELECT  SUM( Datepart(minute, ad.duration) 
                        + Datepart(hour, ad.duration)*60 
                    ) / 15 AS AppointmentSlots
            FROM    Appointments a INNER JOIN AppointmentDetails ad 
                        ON  ad.AppointmentId = a.Id
            WHERE   a.ServiceProviderId = sp.ID 
            AND     ad.StaffMemberId = sms.StaffMemberId
            AND     a.StartDt between @startDate and @endDate
        ) appt
WHERE   sp.CityId = @userCityId 
AND     svc.Name like @serviceName 
AND (   AppointmentSlots < @maxSlots 
OR      AppointmentSlots IS NULL
    )

---

你看过执行计划了吗？@DanielMann是的，它很大，我可以粘贴她你可以使用此网站通过计划@M.Kanarkowski谢谢：过滤谓词AppointSlots<@maxSlots或AppointSlots为null的计划正在被应用为查询的最后一步，使得整个查询比必要的更昂贵。我会将其移动到最内部的CTE，至少在任命部分内部。此外，除了PK之外，任命相关表上存在哪些索引？它没有给出正确的结果，我需要汇总每个员工的职位，以确定该员工是否有开放的任命。我已经创建了服务中的姓名索引，ServiceProvider中的CityId，约会表中的startdt和endDt。。。您是否100%确定原始查询正确计算总数？我可能错了，但是。。。似乎约会cte正在创建交叉连接-这当然可以解释查询速度慢/代价高的原因…在AppointDetails中，AppointDetails.ServiceId和Serv.Id之间没有连接，这将创建部分交叉连接并导致插槽数不正确。。。