SQL Server 2014 - 多个SUM/COUNT与子查询

Question

我有两个部分的问题。

第一部分是关于我在下面做的事情的速度。我正在采集一个数据集并获取每个DISTINCT，然后加入一个子查询，并与标准相加/重复，然后重复这五次。第一个LEFT JOIN后我有一个02秒的运行时间，在第二个LEFT JOIN后我有一个04秒的运行时间，但在第三个LEFT JOIN我的运行时间达到44秒。如果把这个查询放在一边并单独运行，它只是01秒。完成的查询的总运行时间为70秒。

第一部分的问题：

什么让这个查询在第三个显着慢加入？

第二部分：我确信我正以低效的方式完成此任务。我环顾了一会儿，无法找到一种方法来以简单的方式完成我正在做的事情，同时仍然可以为每个子查询制定不同的标准。

第二部分的问题：

是否有完成此查询的更好的办法？

编辑 user1413的评论后。

SELECT DISTINCT开始时在SQL Server执行计划视图中显示了49％的成本。我改变了SELECT DISTINCT正在选择的表格，我的运行时间降到了01秒以下。

SELECT DISTINCT 
    od.location, currentTires, currentAlignments, currentLubes, 
    currentBatteries,currentSiping,currentCarcount 
FROM 
    comm.dbo.ordetail as od 
LEFT JOIN 
    (SELECT 
     od2.location, SUM(od2.qty_shipped) as currentTires 
    FROM 
     comm.dbo.ordetail as od2 
    JOIN 
     comm.dbo.invmas as invmas2 ON invmas2.item_num = od2.item# 
    JOIN 
     comm.dbo.ordhrd as oh2 ON oh2.location = od2.location 
           AND oh2.inv_date = od2.inv_date 
           AND oh2.invoice# = od2.invoice# 
    WHERE 
     (oh2.type_of_rec = '01' OR oh2.type_of_rec = '02') 
     AND od2.inv_date >= '2017-02-01 00:00:00.000' 
     AND od2.inv_date <= '2017-02-28 00:00:00.000' 
     AND (invmas2.category = 'uhp' OR invmas2.category = 'tour' OR invmas2.category = 'mass' OR invmas2.category = 'suv' OR invmas2.category = 'ltat' OR invmas2.category = 'ltmt' OR invmas2.category = 'lthwy' OR invmas2.category = 'snow' OR invmas2.category = 'stdls') 
    GROUP BY 
     od2.location) as currentTires ON od.location = currentTires.location 
LEFT JOIN 
    (SELECT 
     od3.location, SUM(od3.qty_shipped) as currentAlignments 
    FROM 
     comm.dbo.ordetail as od3 
    JOIN 
     comm.dbo.invmas as invmas3 ON invmas3.item_num = od3.item# 
    JOIN 
     comm.dbo.ordhrd as oh3 ON oh3.location = od3.location 
           AND oh3.inv_date = od3.inv_date 
           AND oh3.invoice# = od3.invoice# 
    WHERE 
     (oh3.type_of_rec = '01' OR oh3.type_of_rec = '02') 
     AND od3.inv_date >= '2017-02-01 00:00:00.000' 
     AND od3.inv_date <= '2017-02-28 00:00:00.000' 
     AND (od3.item# = '8501' OR od3.item# = '8502') 
    GROUP BY 
     od3.location) as currentAlignments ON od.location = currentAlignments.location 
LEFT JOIN 
    (SELECT 
     od4.location, SUM(od4.qty_shipped) as currentLubes 
    FROM 
     comm.dbo.ordetail as od4 
    JOIN 
     comm.dbo.invmas as invmas4 ON invmas4.item_num = od4.item# 
    JOIN 
     comm.dbo.ordhrd as oh4 ON oh4.location = od4.location 
           AND oh4.inv_date = od4.inv_date 
           AND oh4.invoice# = od4.invoice# 
    WHERE 
     (oh4.type_of_rec = '01' OR oh4.type_of_rec = '02') 
     AND od4.inv_date >= '2017-02-01 00:00:00.000' 
     AND od4.inv_date <= '2017-02-28 00:00:00.000' 
     AND (od4.item# = '200fs' OR od4.item# = '200c' OR od4.item# = '200m' OR od4.item# = '200s') 
    GROUP BY 
     od4.location) as currentLubes ON od.location = currentLubes.location 
    LEFT JOIN (SELECT od5.location,SUM(od5.qty_shipped) as currentBatteries 
     FROM comm.dbo.ordetail as od5 
     JOIN comm.dbo.invmas as invmas5 
      ON invmas5.item_num = od5.item# 
     JOIN comm.dbo.ordhrd as oh5 
      ON oh5.location = od5.location 
      AND oh5.inv_date = od5.inv_date 
      AND oh5.invoice# = od5.invoice# 
     WHERE (oh5.type_of_rec = '01' OR oh5.type_of_rec = '02') 
      AND od5.inv_date >= '2017-02-01 00:00:00.000' 
      AND od5.inv_date <= '2017-02-28 00:00:00.000' 
      AND invmas5.manufact = 'inter' 
     GROUP BY od5.location) as currentBatteries 
     ON od.location = currentBatteries.location 
    LEFT JOIN (SELECT od6.location,SUM(od6.qty_shipped) as currentSiping 
     FROM comm.dbo.ordetail as od6 
     JOIN comm.dbo.invmas as invmas6 
      ON invmas6.item_num = od6.item# 
     JOIN comm.dbo.ordhrd as oh6 
      ON oh6.location = od6.location 
      AND oh6.inv_date = od6.inv_date 
      AND oh6.invoice# = od6.invoice# 
     WHERE (oh6.type_of_rec = '01' OR oh6.type_of_rec = '02') 
      AND od6.inv_date >= '2017-02-01 00:00:00.000' 
      AND od6.inv_date <= '2017-02-28 00:00:00.000' 
      AND invmas6.manufact = 'inter' 
     GROUP BY od6.location) as currentSiping 
     ON od.location = currentSiping.location 
    LEFT JOIN (SELECT od7.location,COUNT(DISTINCT oh7.invoice#) as currentCarcount 
     FROM comm.dbo.ordetail as od7 
     JOIN comm.dbo.ordhrd as oh7 
      ON oh7.location = od7.location 
      AND oh7.inv_date = od7.inv_date 
      AND oh7.invoice# = od7.invoice# 
     WHERE (oh7.type_of_rec = '01' OR oh7.type_of_rec = '02') 
      AND od7.inv_date >= '2017-02-01 00:00:00.000' 
      AND od7.inv_date <= '2017-02-28 00:00:00.000' 
      AND oh7.veh_make != '' 
      AND od7.item# != '' 
     GROUP BY od7.location) as currentCarcount 
     ON od.location = currentCarcount.location 
    ORDER BY od.location 

采样数据输出：

Answer 1

有很多的事情可以做更好地在这里。对于初学者来说，以下连接中的一个可以被删除，因为od5和od6都返回相同的项目。

LEFT JOIN (SELECT od5.location,SUM(od5.qty_shipped) as currentBatteries 
    FROM comm.dbo.ordetail as od5 
    JOIN comm.dbo.invmas as invmas5 
     ON invmas5.item_num = od5.item# 
    JOIN comm.dbo.ordhrd as oh5 
     ON oh5.location = od5.location 
     AND oh5.inv_date = od5.inv_date 
     AND oh5.invoice# = od5.invoice# 
    WHERE (oh5.type_of_rec = '01' OR oh5.type_of_rec = '02') 
     AND od5.inv_date >= '2017-02-01 00:00:00.000' 
     AND od5.inv_date <= '2017-02-28 00:00:00.000' 
     AND invmas5.manufact = 'inter' 
    GROUP BY od5.location) as currentBatteries 
    ON od.location = currentBatteries.location 
LEFT JOIN (SELECT od6.location,SUM(od6.qty_shipped) as currentSiping 
    FROM comm.dbo.ordetail as od6 
    JOIN comm.dbo.invmas as invmas6 
     ON invmas6.item_num = od6.item# 
    JOIN comm.dbo.ordhrd as oh6 
     ON oh6.location = od6.location 
     AND oh6.inv_date = od6.inv_date 
     AND oh6.invoice# = od6.invoice# 
    WHERE (oh6.type_of_rec = '01' OR oh6.type_of_rec = '02') 
     AND od6.inv_date >= '2017-02-01 00:00:00.000' 
     AND od6.inv_date <= '2017-02-28 00:00:00.000' 
     AND invmas6.manufact = 'inter' 
    GROUP BY od6.location) as currentSiping 
    ON od.location = currentSiping.location 

至于性能和可读性尝试下面的东西。注意：我无法对此进行测试，但是，它可能会让有更多时间调整查询性能的人知道。

DECLARE @LowDate DATETIME = '2017-02-01 00:00:00.000' 
DECLARE @HighDate DATETIME = '2017-02-28 00:00:00.000' 


SELECT 
    DetailList.location, 
    currentTires = SUM(currentTires), 
    currentAlignments = SUM(currentAlignments), 
    currentLubes = SUM(currentLubes), 
    currentBatteries = SUM(currentBatteries), 
    currentSiping = SUM(currentSiping),   
    carCount = SUM(hasCar) 
FROM 
(
    SELECT 
     od.location, 
     currentLubes=CASE WHEN (od.item# = '200fs' OR od.item# = '200c' OR od.item# = '200m' OR od.item# = '200s') THEN od.qty_shipped ELSE NULL END, 
     currentAlignments=CASE WHEN (od.item# = '8501' OR od.item# = '8502') THEN od.qty_shipped ELSE NULL END, 
     currentSiping = CASE WHEN (invmas.item_num = 'p15' OR invmas.item_num = 'u15') THEN od.qty_shipped ELSE NULL END, 
     currentBatteries = CASE WHEN invmas.manufact = 'inter' THEN od.qty_shipped ELSE NULL END, 
     currentTires= CASE WHEN (invmas.category = 'uhp' OR invmas.category = 'tour' OR invmas.category = 'mass' OR invmas.category = 'suv' OR invmas.category = 'ltat' OR 
        invmas.category = 'ltmt' OR invmas.category = 'lthwy' OR invmas.category = 'snow' OR invmas.category = 'stdls') THEN od.qty_shipped ELSE NULL END, 
    hasCar= CASE WHEN (oh.veh_make != '' AND od.item# !='') THEN 1 ELSE 0 END 
    FROM 
     comm.dbo.ordetail as od 
     LEFT JOIN comm.dbo.invmas as invmas ON invmas.item_num = od.item# --FOR currentCarcount 
     INNER JOIN comm.dbo.ordhrd as oh ON oh.location = od.location AND oh.inv_date = od.inv_date AND oh.invoice# = od.invoice# 
    WHERE 
     od.inv_date BETWEEN '2017-02-01 00:00:00.000' AND '2017-02-28 00:00:00.000' 
     AND 
     oh.type_of_rec IN('01','02') 
)AS DetailList 
GROUP BY 
    DetailList.location