按重叠日期进行 SQL 分区

Question

我有如下表，如果日期基于相同的成员 ID 重叠，我想对表进行分区。我使用以下代码，但它仅根据成员 ID 进行分区，但不根据重叠日期进行分区。如何包含也考虑重叠日期的分区？

ID MemberID StartDate   EndDate      
1  2        2015-01-01  2015-02-28
2  2        2015-02-02  2015-02-03 
3  2        2015-05-01  2015-05-20 
4  1        2015-02-01  2015-02-28 
5  2        2015-02-01  2015-03-01 


SELECT *
,ROW_NUMBER() OVER(PARTITION BY MEMBERID ORDER BY ID) AS GROUPID
FROM TABLENAME AS A


ID MemberID StartDate   EndDate      
1  2        2015-01-01  2015-02-28
2  2        2015-02-01  2015-02-03 
3  2        2015-05-01  2015-05-20 
4  1        2015-02-01  2015-02-28 
5  2        2015-02-01  2015-03-01 

当前输出:

ID MemberID StartDate   EndDate      GROUPID
4  1        2015-02-01  2015-02-28   1
1  2        2015-01-01  2015-02-28   1
2  2        2015-02-02  2015-02-03   2
3  2        2015-05-01  2015-05-20   3
5  2        2015-02-01  2015-03-01   4

预期输出:

ID MemberID StartDate   EndDate      GROUPID
4  1        2015-02-01  2015-02-28   1
1  2        2015-01-01  2015-02-28   1
2  2        2015-02-02  2015-02-03   2
5  2        2015-02-01  2015-02-28   3
3  2        2015-05-01  2015-05-20   1

Answer 1

此查询给出正确的输出:

WITH ord as (
    SELECT ID, MemberID
        , StartDate, EndDate
        , n = ROW_NUMBER() over(partition by [MemberID] order by [StartDate], [EndDate])
    FROM @data d1
), first as (
    SELECT o1.ID, o1.MemberID
        , o1.n
    FROM ord o1
    INNER JOIN ord o2 ON o1.MemberID = o2.MemberID AND o2.n+1 = o1.n AND o1.StartDate > o2.EndDate
), groups as (
    SELECT o.ID, o.MemberID
        , p = ROW_NUMBER() over(partition by o.MemberID, MIN(coalesce(f.n, 1)) ORDER BY o.ID)
    FROM ord o
    LEFT JOIN first f ON o.MemberID = f.MemberID AND o.n < f.n
    GROUP BY o.ID, o.MemberID
)
SELECT g.ID, g.MemberID, d.StartDate, d.EndDate, GROUPID = g.p
FROM groups g
INNER JOIN @data d ON g.ID = d.ID

请注意，必须使用更多数据对其进行测试。

输出:

ID  MemberID    StartDate   EndDate     GROUPID
4   1           2015-02-01  2015-02-28  1
3   2           2015-05-01  2015-05-20  1
1   2           2015-01-01  2015-02-28  1
2   2           2015-02-02  2015-02-03  2
5   2           2015-02-01  2015-03-01  3

您的数据:

declare @data table([ID] int, [MemberID] int, [StartDate] date, [EndDate] date);
Insert into @data([ID], [MemberID], [StartDate], [EndDate])
VALUES
    (1, 2, '2015-01-01', '2015-02-28'),
    (2, 2, '2015-02-02', '2015-02-03'),
    (3, 2, '2015-05-01', '2015-05-20'),
    (4, 1, '2015-02-01', '2015-02-28'),
    (5, 2, '2015-02-01', '2015-03-01')
;