TSQL – 如何找到日期之间缺少的月份？

2019年8月4日 193次阅读

我有下表：

UserID | DeptNumber | BeginDate           | EndDate             |
123456 | 1000010001 | 2013-11-15 00:00:00 | 2014-04-24 00:00:00 |
789012 | 1000010002 | 2014-04-25 00:00:00 | 2014-07-01 00:00:00 |
345678 | 1000010003 | 2014-07-02 00:00:00 | NULL                |

如何填写缺失的月份,以便我有这样的事情：

UserID | DeptNumber | Month
123456 | 1000010001 | 11 
123456 | 1000010001 | 12
123456 | 1000010001 | 1
123456 | 1000010001 | 2
123456 | 1000010001 | 3
789012 | 1000010002 | 4
789012 | 1000010002 | 5
789012 | 1000010002 | 6
345678 | 1000010003 | 7
345678 | 1000010003 | 8
345678 | 1000010003 | 9
345678 | 1000010003 | 10

最佳答案 如果enddate不为null且日期类似于’2014-10-30’那么这可能会对您有所帮助

CREATE TABLE #tblName
  (
     UserID     INT,
     startdate  DATETIME,
     endate     DATETIME,
     DeptNumber BIGINT
  )

INSERT INTO #tblName
VALUES      (123456,'2013-11-15 00:00:00','2014-04-24 00:00:00',1000010001),
            (789012,'2014-04-25 00:00:00','2014-07-01 00:00:00',1000010002),
            (345678,'2014-07-02 00:00:00','2014-10-30 00:00:00',1000010003)

DECLARE @mindate DATETIME,
        @maxdate DATETIME

SELECT @mindate = Min(startdate),
       @maxdate = Max(endate)
FROM   #tblName;

WITH cte
     AS (SELECT @mindate startdate
         UNION ALL
         SELECT Dateadd(mm, 1, startdate) startdate
         FROM   cte
         WHERE  startdate <= @maxdate)
SELECT userid,
       DeptNumber,
       Datepart(mm, a.startdate) [Month]
FROM   cte a
       JOIN #tblName b
         ON a.startdate BETWEEN b.startdate AND b.endate

产量

userid  DeptNumber  Month

123456  1000010001  11
123456  1000010001  12
123456  1000010001  1
123456  1000010001  2
123456  1000010001  3
123456  1000010001  4
789012  1000010002  5
789012  1000010002  6
345678  1000010003  7
345678  1000010003  8
345678  1000010003  9
345678  1000010003  10
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