SQL 这将排除某些记录

Question

我正在为我们公司撰写一份速度报告。这是从我们的车队收集的数据。我们已配置参数，以根据他们驾驶的州、该位置发布的速度限制等来标记超速超过特定阈值的人。

我的 SQL 查询正在使用 CTE。当 select 从我的 CTE 中读取时，我在其中包装了两个 select 语句。一个 select 语句用于满足或超过阈值要求的记录。我有一个名为 SpeedingEvent 的字段，这些记录包含 "Y" 的值（表示是）。第二个select语句返回的是不满足或超过阈值的记录，SpeedingEvent值为"N"表示No。这两个select语句的结果用一个UNION连接.

有点奇怪，但我的公司也希望能够看到发生的超速事件，即使它们没有达到阈值。我的问题是，其中一些被排除的记录，即 SpeedingEvent 值为 "N" 的记录，在 SpeedingEvent = "Y" 且日期和舰队编号匹配的数据集中没有匹配记录.

因此，当我的 SSRS 报告生成时，我看到这些数据行被排除在外，但与确实满足阈值的现有记录没有任何关系。

我已尝试创建子查询，但它不起作用，因为我收到一条错误消息，指出子查询返回了超过 1 个值，并且在使用某些比较值时不允许这样做。

这是我的代码示例。这不是全部，因为返回的字段很多。

WITH cteSpeedReport([List of fields])
AS
(
SELECT DISTINCT
     [List of fields]
FROM
     [4 views that are being joined]
WHERE
     [Criteria for meeting threshold]
)
SELECT DISTINCT
     [List of Fields]
FROM (
SELECT DISTINCT DStartDate, DEndDate, DAssetID, DFleet, (DMax - DStateLimit) as DMaxOver, DEventStart, DEventEnd, DTotalEventSpeedingTime, EventSpeedingTimeInSeconds, DLimit, DStateLimit, DMax, EquipTypeQualifier, NDAssetID, NDFleet, NDDate, NDDriveTime, NDTotalDriveTimeInSeconds, SpeedPercentage, MilesSpeeding, CLatLong, CMapLink, CLocation, CMaxReportedSpeed, hlvl1no, hlvl1name, hlvl2no, hlvl2name, hlvl3no, hlvl3name, hlvl9no, hlvl9name, asset_id, asset_descr, equip_type, equiptype_code, insp_fleet, MaxSpdStartTime, MaxSpdEndTime, cast('Y' as char(1)) SpeedingEvent
from cteSpeedReport cteSR
where   
    (EquipTypeQualifier = 'Y' 
    AND ((CLocation = 'Michigan' AND 
            (DLimit = 70 AND DMax >= 70)
            OR (DLimit = 65 AND DMax >= 71.5)
            OR (DLimit = 60 AND DMax > 66)
            OR (DLimit <= 55 AND DMax >= (DLimit * 1.10)))
        OR (CLocation = 'Indiana' AND
            (DLimit = 70 AND DMax > 71.5)
            OR (DLimit = 65 AND DMax > 71.5)
            OR (DLimit <= 55 AND DMax >= (DLimit * 1.10)))))
    OR (DMax >= (DLimit * 1.10))
UNION
SELECT DISTINCT DStartDate, DEndDate, DAssetID, DFleet, (DMax - DStateLimit) as DMaxOver, DEventStart, DEventEnd, DTotalEventSpeedingTime, EventSpeedingTimeInSeconds, DLimit, DStateLimit, DMax, EquipTypeQualifier, NDAssetID, NDFleet, NDDate, NDDriveTime, NDTotalDriveTimeInSeconds, SpeedPercentage, MilesSpeeding, CLatLong, CMapLink, CLocation, CMaxReportedSpeed, hlvl1no, hlvl1name, hlvl2no, hlvl2name, hlvl3no, hlvl3name, hlvl9no, hlvl9name, asset_id, asset_descr, equip_type, equiptype_code, insp_fleet, MaxSpdStartTime, MaxSpdEndTime, cast('N' as char(1)) SpeedingEvent
from cteSpeedReport cteSRN
where   
    (EquipTypeQualifier = 'Y'
    AND ((CLocation = 'Michigan' AND 
            (DLimit = 70 AND DMax < 70)
            OR (DLimit = 65 AND DMax < 71.5)
            OR (DLimit = 60 AND DMax <= 66)
            OR (DLimit <= 55 AND DMax < (DLimit * 1.10)))
        OR (CLocation = 'Indiana' AND
            (DLimit = 70 AND DMax <= 71.5)
            OR (DLimit = 65 AND DMax <= 71.5)
            OR (DLimit <= 55 AND DMax < (DLimit * 1.10))))
    )
    OR (DMax < (DLimit * 1.10))
) a
where
    a.NDTotalDriveTimeInSeconds =
    (SELECT sr.NDTotalDriveTimeInSeconds FROM cteSpeedReport sr
    where sr.DStartDate = a.DStartDate and sr.DFleet = a.DFleet
    )
order by SpeedingEvent desc, DStartDate, hlvl9name, DFleet, DEventStart

如有任何帮助，我们将不胜感激。

Answer 1

我认为问题出在您的 WHERE 子句中，子查询返回多个结果 - 给出 .

WHERE a.NDTotalDriveTimeInSeconds =
  (SELECT sr.NDTotalDriveTimeInSeconds FROM cteSpeedReport sr
  WHERE sr.DStartDate = a.DStartDate AND sr.DFleet = a.DFleet )

您可以将其更改为 MAX 或 SUM 或向 WHERE 子句添加更多条件 - 具体取决于逻辑的工作方式。

WHERE a.NDTotalDriveTimeInSeconds =
  (SELECT SUM(sr.NDTotalDriveTimeInSeconds) FROM cteSpeedReport sr
  WHERE sr.DStartDate = a.DStartDate AND sr.DFleet = a.DFleet )

另一方面，您可以过滤一般结果，然后使用 CASE 语句来确定 Y 或 N，而不是合并两种可能性 对于 SpeedingEvent 列。

SELECT DISTINCT
     [List of Fields]
FROM (
    SELECT DISTINCT DStartDate, DEndDate, DAssetID, DFleet, (DMax - DStateLimit) as DMaxOver, DEventStart, DEventEnd, DTotalEventSpeedingTime, 
            EventSpeedingTimeInSeconds, DLimit, DStateLimit, DMax, EquipTypeQualifier, NDAssetID, NDFleet, NDDate, NDDriveTime, NDTotalDriveTimeInSeconds, 
            SpeedPercentage, MilesSpeeding, CLatLong, CMapLink, CLocation, CMaxReportedSpeed, hlvl1no, hlvl1name, hlvl2no, hlvl2name, hlvl3no, 
            hlvl3name, hlvl9no, hlvl9name, asset_id, asset_descr, equip_type, equiptype_code, insp_fleet, MaxSpdStartTime, MaxSpdEndTime, 
            CAST(
            CASE WHEN (CLocation = 'Michigan' AND (DLimit = 70 AND DMax < 70)
                        OR (DLimit = 65 AND DMax < 71.5)
                        OR (DLimit = 60 AND DMax <= 66)
                        OR (DLimit <= 55 AND DMax < (DLimit * 1.10)))
                    OR (CLocation = 'Indiana' AND (DLimit = 70 AND DMax <= 71.5)
                        OR (DLimit = 65 AND DMax <= 71.5)
                        OR (DLimit <= 55 AND DMax < (DLimit * 1.10)))
                THEN 'Y' ELSE 'N' END AS CHAR(1)) SpeedingEvent
    FROM cteSpeedReport cteSR
    WHERE   
        EquipTypeQualifier = 'Y' 
) a
WHERE a.NDTotalDriveTimeInSeconds = 
    (SELECT SUM(sr.NDTotalDriveTimeInSeconds) 
        FROM cteSpeedReport sr
        WHERE sr.DStartDate = a.DStartDate AND sr.DFleet = a.DFleet )
ORDER BY SpeedingEvent DESC, DStartDate, hlvl9name, DFleet, DEventStart

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