重疊---沒有臨時表結果的時間範圍是錯的

Question

下面是一個有效的SQL查詢，用於計算具有重疊的時間差異。
由於某些原因，我需要創建一個視圖 - 因此我不能使用臨時表TempALMDB。相反，視圖以SELECT X.Alarmgroup開始，我必須使用已經創建的視圖QV_Alarms。但在這種情況下，輸出與臨時表的版本不同。

原始視圖包含以下colums： Alarmgroup，AlarmON，AlarmOFF，優先級，...

AlarmOn和AlarmOFF是報警的到達和返回時間。計算是爲每個報警組完成的。爲了減少每個查詢的計算時間，我包括Alarmgroup和Priority（在臨時表中）的WHERE子句。第二部分也可以爲小組討論。

我的問題：
1.當我僅使用第2部分（用QV_Alarms替換了4次TempALMDB）時，爲什麼會得到不同的錯誤結果？
2.如何在第2部分中包含優先級的WHERE子句？

-- PART 1: Temporary table 
IF EXISTS(SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'TempALMDB') 
DROP TABLE TempALMDB 

Select TOP 500 Alarmgroup, AlarmON, AlarmOff INTO TempALMDB FROM QV_Alarms 
WHERE Alarmgroup = 'A1_1_Alarms' 
ORDER BY Alarmgroup, AlarmON 

--PART 2: Time difference calculation 
SELECT X.Alarmgroup, X.Coming, X.Going, Datediff(minute, X.Coming, X.Going) 
AS minutes FROM (
    SELECT G2.Alarmgroup, Min(G2.Start1) AS Coming, Max(G2.Going1) 
    AS Going FROM (
    SELECT G1.Alarmgroup, Min(G1.Start2) AS Start1, Max(G1.Going2) 
    AS Going1 FROM (
     SELECT T1.Alarmgroup, Min(T1.AlarmON) AS Start2, Max(T1.AlarmOff) 
     AS Going2 FROM TempALMDB AS T1 INNER JOIN TempALMDB AS T2 
     ON (T1.Alarmgroup = T2.Alarmgroup AND T1.AlarmON < T2.AlarmOff 
     AND T1.AlarmOff > T2.AlarmON AND NOT (T1.AlarmON = T2.AlarmON 
     AND T1.AlarmOff = T2.AlarmOff)) 
     GROUP BY T1.Alarmgroup, 
     CASE WHEN T1.AlarmON BETWEEN T2.AlarmON AND T2.AlarmOff 
     THEN T2.AlarmON ELSE T1.AlarmON END, 
     CASE WHEN T1.AlarmOff BETWEEN T2.AlarmON AND T2.AlarmOff 
     THEN T2.AlarmOff ELSE T1.AlarmOff END 
    ) AS G1 
    GROUP BY G1.Alarmgroup, G1.Going2) AS G2 
    GROUP BY G2.Alarmgroup, G2.Start1 

UNION ALL 

SELECT U1.Alarmgroup, U1.AlarmON, U1.AlarmOff 
FROM TempALMDB AS U1 LEFT JOIN TempALMDB AS U2 
ON (U1.Alarmgroup = U2.Alarmgroup AND U1.AlarmON < U2.AlarmOff 
AND U1.AlarmOff > U2.AlarmON 
AND NOT (U1.AlarmON = U2.AlarmON AND U1.AlarmOff = U2.AlarmOff)) 
WHERE U2.Alarmgroup IS NULL 
) AS X 
WHERE X.Alarmgroup = 'A1_1_Alarms' 
ORDER BY X.Alarmgroup, X.Coming, X.Going 

Answer 1

您是否嘗試過用第二部分替換TempALMDB的所有實例？

(Select TOP 500 Alarmgroup, AlarmON, AlarmOff FROM QV_Alarms 
WHERE Alarmgroup = 'A1_1_Alarms' 
ORDER BY Alarmgroup, AlarmON)