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将不同日期范围中的类似对象分组,以获取SQL Server中的最小和最大日期

sql-server-2008 sql-server sql

Manav Kotian · 技术社区 · 7 年前

我有一张桌子:

account   | onln_status |   browse status | beg_date |  end_date
----------+-------------+-----------------+----------+-------------
123456789 | On          |   Y             | 1/1/2018 |  2/1/2018
123456789 | On          |   N             | 2/2/2018 |  4/1/2018
123456789 | On          |   Y             | 4/2/2018 |  5/1/2018
123456789 | Off         |   N             | 5/2/2018 |  7/1/2018
123456789 | Off         |   Y             | 7/2/2018 |  8/1/2018
123456789 | On          |   Y             | 8/2/2018 |  10/1/2018
123456789 | On          |   N             | 10/2/2018|  11/1/2018

并需要结果显示:

account   | onln_status |   beg_date |  end_date
----------+-------------+------------+------------
123456789 | On          |   1/1/2018 |  5/1/2018
123456789 | Off         |   5/2/2018 |  8/1/2018
123456789 | On          |   8/2/2018 |  11/1/2018

起初,我使用min(beg-date)和max(end-date),但在这种情况下不起作用:

select 
    omsid, onln_status, min(beg_date), max(end_date)
from 
    table
group by 
    omsid, onln_status

我还尝试在以前的online\u状态发生变化时获取唯一的号码,但无法将其添加到号码上:

 select 
     *, 
     case 
        when onln_status <> lag(onln_status) over (partition by account order by beg_date)
           then 1 
          else 0
     end as status_change
 from 
     table

1 回复 | 直到 7 年前

Thom A 7 年前

这应该可以让你继续:

CREATE TABLE Account (AccountID bigint,
                      onln_status varchar(3),
                      BrowseStatus char(1),
                      Beg_date date,
                      End_Date date);
GO

INSERT INTO Account
SELECT A, O, B, CONVERT(date,S,101), CONVERT(date,E,101)
FROM (
    VALUES (123456789,'On','Y','1/1/2018','2/1/2018'),
           (123456789,'On','N','2/2/2018','4/1/2018'),
           (123456789,'On','Y','4/2/2018','5/1/2018'),
           (123456789,'Off','N','5/2/2018','7/1/2018'),
           (123456789,'Off','Y','7/2/2018','8/1/2018'),
           (123456789,'On','Y','8/2/2018','10/1/2018'),
           (123456789,'On','N','10/2/2018','11/1/2018')) V(A, O, B, S, E);
GO

WITH Grps AS(
    SELECT *,
           ROW_NUMBER() OVER (ORDER BY Beg_date) - --You may need to add a PARTITION here (I.e. on AccountID)
           ROW_NUMBER() OVER (PARTITION BY onln_status ORDER BY Beg_date) AS Grp --You may need to add a PARTITION here (I.e. on AccountID)
    FROM Account)
SELECT AccountID,
       onln_status,
       MIN(beg_date) AS beg_date,
       MAX(End_date) AS End_Date
FROM Grps
GROUP BY AccountID,
          onln_status,
          Grp;

GO
DROP TABLE Account;

请注意我对 ROW_NUMBER() 虽然您可能需要添加更多分区。