嗨，伙計們！我正在查詢大量的歷史數據，我注意到彈出的獲取行數大約是加載的行數的 3 倍（加載的行數大約是正確的）。我一次獲取1 個月的數據（如果我要求更多，就會中斷）並且數據記錄器的運行頻率略高於1Hz，這意味著我應該一次獲取大約2.5e6 行，但係統說它獲取7.5e6行
這是執行查詢的代碼片段
Open Database(
"driver={SQL Server}; Server=XXXXXXXXXX; database=Runtime; trusted_connection=yes;",
"SET NOCOUNT ON
DECLARE @StartDate DateTime
DECLARE @EndDate DateTime
SET @StartDate = '2023-5-1 00:00:00'
SET @EndDate = '2023-5-31 23:59:59'
SELECT temp.TagName, DateTime = convert(varchar, DateTime, 126), vValue From (
SELECT * FROM History WHERE History.TagName IN (" || tagnamelist || ")
AND vValue IS NOT NULL
AND wwRetrievalMode = 'Delta'
AND wwVersion = 'Latest'
AND DateTime >= @StartDate
AND DateTime <= @EndDate) temp
LEFT JOIN AnalogTag ON AnalogTag.TagName = temp.TagName
LEFT JOIN EngineeringUnit ON AnalogTag.EUKey = EngineeringUnit.EUKey
LEFT JOIN QualityMap ON QualityMap.QualityDetail = temp.QualityDetail
WHERE temp.StartDateTime >= @StartDate"
);以及查詢末尾附近彈出窗口的屏幕截圖
多謝你們！
