簡化T-SQL查詢

如果可能，我想簡化這個查詢。簡化T-SQL查詢

SELECT 
    MAX(tDateTimeOfSurvey) 
FROM 
    Stocks.dbo.tblSurvey 
WHERE 
    ( 
     (SELECT ISNULL(SUM(tWetTons), 0) 
     FROM Stocks.dbo.tblSurvey 
     WHERE tStockAreaID = 3 
      AND tDateTimeOfSurvey BETWEEN '20140201' AND '20140228') + 
     (SELECT ISNULL(SUM(tWetTons), 0) 
     FROM Stocks.dbo.tblSurvey 
     WHERE tStockAreaID = 103 
     AND tDateTimeOfSurvey BETWEEN '20140201' AND '20140228') + 
     (SELECT ISNULL(SUM(tWetTons), 0) 
     FROM Stocks.dbo.tblSurvey 
     WHERE tStockAreaID = 181 
     AND tDateTimeOfSurvey BETWEEN '20140201' AND '20140228') 
    ) > 0 
AND tStockAreaID IN (3,103,181) -- RAS, SOIL, DORB 
AND tDateTimeOfSurvey BETWEEN '20140201' AND '20140228'

非常感謝，皮埃爾

來源

2014-03-06 Pierre Cornelissen

請分享您的DDL的表，一些樣本數據和樣本結果解釋你想達到什麼目的？ – Mureinik

你到目前爲止嘗試過什麼？你簡化的目標是什麼？也就是說，您是否遇到性能問題或結果不正確？ –

這似乎微不足道 - 爲什麼有三個子查詢，當你只有一個'tStockAreaID在（3,103,181）'？ –

請嘗試：

SELECT MAX(tDateTimeOfSurvey) 
FROM Stocks.dbo.tblSurvey 
WHERE 
    tStockAreaID IN (3,103,181) AND 
    tDateTimeOfSurvey BETWEEN '20140201' AND '20140228' 
HAVING SUM(tWetTons)>0

來源

2014-03-06 11:54:21 TechDo

是@StuartLC謝謝:) – TechDo

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