Question

我在下面的查询中获取了设备全天开启的百分比时间，但是由于数据中有重复项，我不能轻易摆脱，最好的方法是什么？< / p>

我尝试过使用distinct和Max（dtReading）

system ('taskkill /IM Winium.Desktop.Driver.exe /f')

查询输出

    SELECT DISTINCT
  workStationNo,
  controllerID,

  CAST(DATEPART(DAY, DATEADD(DAY, DATEDIFF(DAY, 0, MAX(dtReading)), 0)) AS varchar) AS date,
  (CAST(COUNT(*) AS float(1)) / CAST((DATEPART(HOUR, GETDATE()) * 30) AS float(1)) * CAST(100 AS float(1))) AS dayPercentage

FROM Controller
INNER JOIN ManufacturingLayout
  ON Controller.machID = ManufacturingLayout.workStationID
INNER JOIN ReaderData
  ON Controller.ctrlID = ReaderData.controllerID

WHERE dtReading >= CONVERT(datetime, '09/05/2018', 103)
AND dtReading <= DATEADD(HOUR, 24, CONVERT(datetime, '16/05/2018 23:59:59', 103))
AND (EventType = '(0x05)Open switch')
GROUP BY controllerID,
         DATEADD(DAY, DATEDIFF(DAY, 0, dtReading), 0),
         workStationNo
ORDER BY 1, 2

源数据

Workstation no controllerID  date dayPercentage
ZW01006            38         15    80.20833
ZW01006            38         16    142.0833
ZW01007            30         15    62.5
ZW01007            30         16    120.2083
ZW01008            31         15    92.70833
ZW01008            31         16    141.0417
ZW01010            40         15    0.625

Answer 1

您可以为JOIN到ReaderData使用派生表，以便在JOIN之前删除重复项：

...
INNER JOIN (SELECT DISTINCT controllerID, dtReading
            FROM ReaderData) ReaderData
...

从查询中删除重复项

1 个答案: