我有一个 Azure 流分析作业，它结合了多个查询的结果并将它们输出到同一个接收器。为此，我在 WITH 语句中定义我的查询，然后使用 UNION 将它们组合起来，然后将它们写入我的接收器。然而，不幸的是，当我的所有查询实际上都有输出时，我只会得到一个输出到我的接收器，这就是它出错的地方。
我有一些连续（每 5 分钟）给出输出的查询，但我也有一些很少给出输出的查询（可能每天几次）。这会导致输出没有得到任何结果，直到查询都有要返回的内容。有谁知道这是为什么以及我该如何解决？当集合 A 有结果但集合 B 没有结果时，UNION 不应该也给出结果吗？我在 VS Code 中本地运行它，顺便说一下与事件中心的实时连接。
下面是一个出错的 2 个查询的简化示例（一个输出频繁，一个输出不频繁）：
WITH
HarmonizedMeasurements AS (
SELECT
CAST(EHHARM.TimeStamp AS datetime) AS "TimeStamp",
CAST(EHHARM.ValueNumber AS float) AS "ValueNumber",
EHHARM.ValueBit AS "ValueBit",
EHHARM.MeasurementName,
EHHARM.PartName,
EHHARM.ElementId,
EHHARM.ElementName,
EHHARM.ObjectName,
EHHARM.TranslationTableId
FROM EventHubHarmonizedMeasurements AS EHHARM TIMESTAMP BY "TimeStamp"
PARTITION BY TranslationTableId
),
ToerenAandrijvingCategoriesMeasurements AS (
SELECT
AANDRCAT.TimeStamp AS "TimeStamp",
AANDRCAT.ValueNumber AS "ValueNumber",
AANDRCAT.ValueBit AS "ValueBit",
AANDRCAT.MeasurementName AS "MeasurementName",
AANDRCAT.PartName AS "PartName",
AANDRCAT.ElementId AS "ElementId",
AANDRCAT.ElementName AS "ElementName",
AANDRCAT.ObjectName AS "ObjectName",
AANDRCAT.TranslationTableId AS "TranslationTableId",
CASE
WHEN (-5000 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= -1000) THEN 'Dalen'
WHEN (-1000 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= -200) THEN 'Dalen Retarderen'
WHEN (-200 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= 0) THEN 'Stilstand'
WHEN (0 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= 250) THEN 'Nivelleren'
WHEN (250 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= 400) THEN 'Heffen Retarderen'
WHEN (400 < AANDRCAT.ValueNumber AND AANDRCAT.ValueNumber <= 5000) THEN 'Heffen'
ELSE 'NoCategory'
END AS "Category"
FROM HarmonizedMeasurements AS AANDRCAT
WHERE
AANDRCAT.ObjectName LIKE 'Schutsluis%' AND
AANDRCAT.MeasurementName = 'Motortoerental terugkoppeling' AND
AANDRCAT.ValueNumber <> 0
),
AandrijvingCatStartMeasurements AS (
SELECT
AANDRCAT.TimeStamp AS "StartTime",
AANDRCAT.Category AS "Category",
AANDRCAT.ElementId AS "ElementId",
AANDRCAT.TranslationTableId AS "TranslationTableId"
FROM ToerenAandrijvingCategoriesMeasurements AS AANDRCAT
WHERE
LAG(Category, 1) OVER (PARTITION BY ElementId LIMIT DURATION(day, 1)) <> Category
),
AandrijvingCatEndMeasurements AS (
SELECT
AANDRST.StartTime AS "EndTime",
LAG(AANDRST.StartTime, 1) OVER (PARTITION BY ElementId LIMIT DURATION(day, 1)) AS "StartTime",
LAG(AANDRST.Category, 1) OVER (PARTITION BY ElementId LIMIT DURATION(day, 1)) AS "Category",
AANDRST.ElementId AS "ElementId",
AANDRST.TranslationTableId AS "TranslationTableId"
FROM AandrijvingCatStartMeasurements AS AANDRST
),
VermogenAandrijvingMeasurements AS (
SELECT
AANDRVER.TimeStamp AS "TimeStamp",
AANDRVER.ValueNumber AS "ValueNumber",
AANDRVER.ValueBit AS "ValueBit",
CONCAT(AANDRVER.MeasurementName, ' ', AANDREN.Category) AS "MeasurementName",
AANDRVER.PartName AS "PartName",
AANDRVER.ElementId AS "ElementId",
AANDRVER.ElementName AS "ElementName",
AANDRVER.ObjectName AS "ObjectName",
AANDRVER.TranslationTableId AS "TranslationTableId"
FROM HarmonizedMeasurements AS AANDRVER
LEFT JOIN AandrijvingCatEndMeasurements AS AANDREN
ON DATEDIFF(minute, AANDRVER, AANDREN) BETWEEN 0 AND 30 AND
AANDRVER.TimeStamp >= AANDREN.StartTime AND
AANDRVER.Timestamp < AANDREN.EndTime AND
AANDRVER.ElementId = AANDREN.ElementId AND
AANDRVER.TranslationTableId = AANDREN.TranslationTableId
INNER JOIN SQLMeasurementType AS MEAS
ON MEAS.Name = CONCAT(AANDRVER.MeasurementName, ' ', AANDREN.Category)
WHERE
AANDRVER.ObjectName LIKE 'Schutsluis%' AND
AANDRVER.MeasurementName = 'Vermogen'
),
LockDoorTop AS (
SELECT
Lock.TimeStamp AS "TimeStamp",
Lock.ValueNumber AS "ValueNumber",
Lock.ValueBit AS "ValueBit",
Lock.MeasurementName,
Lock.PartName,
Lock.ElementId,
Lock.ElementName,
Lock.ObjectName,
Lock.TranslationTableId
FROM HarmonizedMeasurements AS Lock
WHERE
Lock.MeasurementName = 'Sluisdeur open' AND
Lock.ElementName = 'Deur sluiskolk 1' AND
Lock.PartName = 'Bovenhoofd' AND
Lock.ValueBit = '1'
),
WaterLTop AS (
SELECT
WaterTop.TimeStamp AS "TimeStamp",
WaterTop.ValueNumber AS "ValueNumber",
WaterTop.ValueBit AS "ValueBit",
WaterTop.MeasurementName,
WaterTop.PartName,
WaterTop.ElementId,
WaterTop.ElementName,
WaterTop.ObjectName,
WaterTop.TranslationTableId
FROM HarmonizedMeasurements AS WaterTop
WHERE
WaterTop.MeasurementName = 'Waterniveaumeting' AND
WaterTop.ElementName = 'Sluiskolk 1' AND
WaterTop.PartName = 'Opvaartzijde'
),
WaterLLock AS (
SELECT
WaterLock.TimeStamp AS "TimeStamp",
WaterLock.ValueNumber AS "ValueNumber",
WaterLock.ValueBit AS "ValueBit",
WaterLock.MeasurementName,
WaterLock.PartName,
WaterLock.ElementId,
WaterLock.ElementName,
WaterLock.ObjectName,
WaterLock.TranslationTableId
FROM HarmonizedMeasurements AS WaterLock
WHERE
WaterLock.MeasurementName = 'Waterniveaumeting' AND
WaterLock.ElementName = 'Sluiskolk 1' AND
WaterLock.PartName = 'Sluiskamer'
),
WaterLevelTopMeasurements AS (
SELECT
LockDoor.TimeStamp AS "TimeStamp",
CAST(ROUND((WaterLevelLock.ValueNumber - WaterLevelTop.ValueNumber), 2) AS float) AS "ValueNumber",
null AS "ValueBit",
MEAS.Name AS "MeasurementName",
LockDoor.PartName AS "PartName",
LockDoor.ElementId AS "ElementId",
LockDoor.ElementName AS "ElementName",
LockDoor.ObjectName AS "ObjectName",
LockDoor.TranslationTableId AS "TranslationTableId"
FROM LockDoorTop AS LockDoor
JOIN WaterLTop AS WaterLevelTop
ON DATEDIFF(minute, LockDoor, WaterLevelTop) BETWEEN 0 AND 1 AND
LockDoor.ObjectName = WaterLevelTop.ObjectName
JOIN WaterLLock AS WaterLevelLock
ON DATEDIFF(minute, LockDoor, WaterLevelLock) BETWEEN 0 AND 1 AND
LockDoor.ObjectName = WaterLevelLock.ObjectName
INNER JOIN SQLMeasurementType AS MEAS
ON MEAS.Name = 'Waterniveauverschil'
),
-- Combine queries
DatalakeCombinedMeasurements AS (
SELECT * FROM VermogenAandrijvingMeasurements
UNION
SELECT * FROM WaterLevelTopMeasurements
)
-- Output data
SELECT *
INTO DatalakeHarmonizedMeasurements
FROM DatalakeCombinedMeasurements
PARTITION BY TranslationTableId