T-SQL Berechne die Dauer in Monaten zwischen verschiedenen Jahren von Bereichen

Question

Ich habe eine Tabelle in SQL Server, die die Dauer eines Benutzers für verschiedene Jobs enthält. Ich muss die Gesamtzahl der Erfahrung für Benutzer berechnen.

Declare @temp table(Id int, FromDate DATETIME, ToDate DATETIME) 
INSERT INTO @temp (Id ,FromDate ,ToDate) 
VALUES (1 , '2003-1-08 06:55:56' , '2005-5-08 06:55:56'), 
     (2 , '2000-10-08 06:55:56' , '2008-7-08 06:55:56'), 
     (3 , '2013-6-08 06:55:56' , '2015-1-08 06:55:56'), 
     (4 , '2006-4-08 06:55:56' , '2011-3-08 06:55:56') 
SELECT * FROM @temp 

Ich möchte die Gesamtzahl der Erfahrung berechnen;

Id FromDate ToDate  Difference IN Months 
=================================================== 
1 2003-01-08 2005-05-08 28 
2 2000-10-08 2008-07-08 93 
3 2013-06-08 2015-01-08 19 
4 2006-04-08 2011-03-08 59 

nach dem Entfernen der Jahre überlappend wie 2003-2005 deckt in 2000-2008; Ich habe so etwas wie dies:

Id FromDate ToDate  Difference IN Months 
===================================================  
1 2000-10-08 2011-03-08 125 
2 2013-06-08 2015-01-08 19 

So ist die Antwort würde 125+19 = 144 Monate sein. Bitte helfen Sie mir, eine Lösung zu finden.

Answer 1

Die Syntax hier findet alle FromDate, die kein überlappendes FromDate- und ToDate-Intervall und alle ToDates haben, die kein überlappendes FromDate- und ToDate-Intervall haben. ihnen eine rownumber geben nach dem Datumswert und passende sie an diesem rownumber:

;WITH CTE as 
(
    SELECT min(Id) Id ,FromDate, row_number() over (ORDER BY FromDate) rn 
    FROM @temp x 
    WHERE 
    not exists 
     (SELECT * FROM @temp WHERE x.FromDate > FromDate and x.FromDate <= Todate) 
    GROUP BY FromDate 
), CTE2 as 
(
    SELECT Max(Id) Id ,ToDate, row_number() over (ORDER BY ToDate) rn 
    FROM @temp x 
    WHERE 
    not exists 
     (SELECT * FROM @temp WHERE x.ToDate >= FromDate and x.ToDate < Todate) 
    GROUP BY ToDate 
) 
SELECT SUM(DateDiff(month, CTE.FromDate, CTE2.ToDate)) 
FROM CTE 
JOIN CTE2 
ON CTE.rn = CTE2.rn 

Ergebnis:

144 

Answer 2

Sie können versuchen, diese

SELECT Set1.FromDate,MIN(List1.ToDate) AS ToDate, DATEDIFF(MONTH,Set1.FromDate,MIN(List1.ToDate)) 
    FROM @temp Set1 
    INNER JOIN @temp List1 ON Set1.FromDate <= List1.ToDate 
    AND NOT EXISTS(SELECT * FROM @temp List2 

    WHERE List1.ToDate >= List2.FromDate AND List1.ToDate < List2.ToDate) 
    WHERE NOT EXISTS(SELECT * FROM @temp Set2 
    WHERE Set1.FromDate > Set2.FromDate AND Set1.FromDate <= Set2.ToDate) 

    GROUP BY Set1.FromDate 
    ORDER BY Set1.FromDate 

Answer 3

Sie können diesen Code versuchen:

DECLARE @temp TABLE (ID INT, FromDate DATETIME, ToDate DATETIME) 
INSERT INTO @temp (ID, FromDate, ToDate) 
VALUES (1 , '2003-1-08 06:55:56' , '2005-5-08 06:55:56'), 
     (2 , '2000-10-08 06:55:56' , '2008-7-08 06:55:56'), 
     (3 , '2013-6-08 06:55:56' , '2015-1-08 06:55:56'), 
     (4 , '2006-4-08 06:55:56' , '2011-3-08 06:55:56') 
SELECT 
    ID, 
    CONVERT(DATE, FromDate) AS FromDate, 
    CONVERT(DATE, ToDate) AS ToDate, 
    DATEDIFF(MONTH, FromDate, ToDate) AS [Difference IN Months] 
INTO #tmp 
FROM @temp 

SELECT T1.ID AS ID1, T2.ID AS ID2, T2.ToDate, T1.[Difference IN Months] + T2.[Difference IN Months] AS [Difference IN Months] 
INTO #tmp2 
FROM #tmp T1 
INNER JOIN #tmp T2 
    ON CAST(T1.ToDate AS DATE) = CAST(T2.FromDate AS DATE) 
     OR (YEAR(T1.ToDate) = YEAR(T2.FromDate) AND CAST(T1.ToDate AS DATE) < CAST(T2.FromDate AS DATE)) 
     OR YEAR(T1.ToDate) = YEAR(T2.FromDate) - 1 
DELETE #tmp WHERE ID IN (SELECT ID2 FROM #tmp2) 
UPDATE #tmp 
SET ToDate = (SELECT ToDate FROM #tmp2 WHERE #tmp.ID = ID1), 
    [Difference IN Months] = (SELECT [Difference IN Months] FROM #tmp2 WHERE #tmp.ID = ID1) 
WHERE ID IN (SELECT ID1 FROM #tmp2) 

SELECT 
    *, 
    ROW_NUMBER() OVER(ORDER BY FromDate) AS RF 
INTO #tmp3 
FROM #tmp 

SELECT T1.ID AS ID1, T2.ID AS ID2, T1.ToDate 
INTO #tmp4 
FROM #tmp3 T1 
    INNER JOIN #tmp3 T2 ON T1.RF = T2.RF + 1 
WHERE CAST(T1.FromDate AS DATE) < CAST(T2.ToDate AS DATE) 

UPDATE #tmp 
SET ToDate = (SELECT ToDate FROM #tmp4 WHERE #tmp.ID = ID2) 
WHERE ID IN (SELECT ID2 FROM #tmp4) 
DELETE #tmp WHERE ID IN (SELECT ID1 FROM #tmp4) 

UPDATE #tmp 
SET[Difference IN Months] = DATEDIFF(MONTH, FromDate, ToDate) 

SELECT 
    ROW_NUMBER() OVER(ORDER BY FromDate) AS ID, 
    FromDate, ToDate, [Difference IN Months] 
FROM #tmp 

DROP TABLE #tmp 
DROP TABLE #tmp2 
DROP TABLE #tmp3 
DROP TABLE #tmp4 

Ergebnis:

ID FromDate ToDate  Difference IN Months 
===================================================  
1 2000-10-08 2011-03-08 125 
2 2013-06-08 2015-01-08 19