Find range of dates based on a column

user_7166287 0
Viewed 57

I'm looking to group the data below by ITEM and "change in" STATUS, but for the below example would expect 3 lines due to the status switching back again.

Presently I'm using MIN(FROM_DT) AND MAX(TO_DATE) but only get 2 lines, due to there only being 2 different values in the STATUS column.

Expected result:

ITEM    FROM_DT     TO_DT       STATUS
ITEM1   02/01/2020  15/05/2020  0
ITEM1   15/05/2020  18/05/2020  1
ITEM1   18/05/2020  31/12/9999  0

Sample Data: 

CREATE TABLE [dbo].[AH_TEMP](
    [ITEM] [varchar](24) NULL,
    [FROM_DT] [datetime] NULL,
    [TO_DT] [datetime] NULL,
    [EXCL] [bit] NULL
) ON [PRIMARY]
GO

INSERT INTO AH_TEMP 
VALUES  
    ('ITEM1','2020-01-02 22:57:01.200','2020-01-07 22:54:52.930','0'),
    ('ITEM1','2020-01-07 22:57:21.950','2020-02-03 22:54:30.500','0'),
    ('ITEM1','2020-02-03 22:58:21.180','2020-03-02 22:54:27.253','0'),
    ('ITEM1','2020-03-02 22:56:30.737','2020-03-18 17:21:23.390','0'),
    ('ITEM1','2020-03-18 17:21:23.403','2020-03-19 09:05:38.060','0'),
    ('ITEM1','2020-03-19 09:05:38.063','2020-03-19 13:57:03.567','0'),
    ('ITEM1','2020-03-19 13:57:03.570','2020-03-19 23:01:41.403','0'),
    ('ITEM1','2020-03-19 23:03:49.900','2020-03-20 23:02:25.437','0'),
    ('ITEM1','2020-03-20 23:04:53.610','2020-04-01 22:59:39.220','0'),
    ('ITEM1','2020-04-01 23:01:45.620','2020-05-01 22:59:09.153','0'),
    ('ITEM1','2020-05-01 23:01:11.980','2020-05-14 14:30:21.930','0'),
    ('ITEM1','2020-05-14 14:30:21.930','2020-05-14 22:57:24.753','0'),
    ('ITEM1','2020-05-14 22:59:17.623','2020-05-15 17:48:34.000','0'),
    ('ITEM1','2020-05-15 17:48:35.000','2020-05-15 22:57:15.923','0'),
    ('ITEM1','2020-05-15 22:59:11.933','2020-05-16 22:54:31.750','1'),
    ('ITEM1','2020-05-16 22:56:26.793','2020-05-18 22:55:01.050','1'),
    ('ITEM1','2020-05-18 23:00:23.103','2020-05-21 22:55:24.400','0'),
    ('ITEM1','2020-05-21 22:57:01.723','2020-06-01 23:00:21.823','0'),
    ('ITEM1','2020-06-01 23:03:12.467','2020-06-08 22:55:20.393','0'),
    ('ITEM1','2020-06-08 22:58:27.710','9999-12-31 00:00:00.000','0');

Returns:

+-------+-------------------------+-------------------------+--------+
| ITEM  |         FROM_DT         |          TO_DT          | STATUS |
+-------+-------------------------+-------------------------+--------+
| ITEM1 | 2020-01-02 22:57:01.200 | 2020-01-07 22:54:52.930 |      0 |
| ITEM1 | 2020-01-07 22:57:21.950 | 2020-02-03 22:54:30.500 |      0 |
| ITEM1 | 2020-02-03 22:58:21.180 | 2020-03-02 22:54:27.253 |      0 |
| ITEM1 | 2020-03-02 22:56:30.737 | 2020-03-18 17:21:23.390 |      0 |
| ITEM1 | 2020-03-18 17:21:23.403 | 2020-03-19 09:05:38.060 |      0 |
| ITEM1 | 2020-03-19 09:05:38.063 | 2020-03-19 13:57:03.567 |      0 |
| ITEM1 | 2020-03-19 13:57:03.570 | 2020-03-19 23:01:41.403 |      0 |
| ITEM1 | 2020-03-19 23:03:49.900 | 2020-03-20 23:02:25.437 |      0 |
| ITEM1 | 2020-03-20 23:04:53.610 | 2020-04-01 22:59:39.220 |      0 |
| ITEM1 | 2020-04-01 23:01:45.620 | 2020-05-01 22:59:09.153 |      0 |
| ITEM1 | 2020-05-01 23:01:11.980 | 2020-05-14 14:30:21.930 |      0 |
| ITEM1 | 2020-05-14 14:30:21.930 | 2020-05-14 22:57:24.753 |      0 |
| ITEM1 | 2020-05-14 22:59:17.623 | 2020-05-15 17:48:34.000 |      0 |
| ITEM1 | 2020-05-15 17:48:35.000 | 2020-05-15 22:57:15.923 |      0 |
| ITEM1 | 2020-05-15 22:59:11.933 | 2020-05-16 22:54:31.750 |      1 |
| ITEM1 | 2020-05-16 22:56:26.793 | 2020-05-18 22:55:01.050 |      1 |
| ITEM1 | 2020-05-18 23:00:23.103 | 2020-05-21 22:55:24.400 |      0 |
| ITEM1 | 2020-05-21 22:57:01.723 | 2020-06-01 23:00:21.823 |      0 |
| ITEM1 | 2020-06-01 23:03:12.467 | 2020-06-08 22:55:20.393 |      0 |
| ITEM1 | 2020-06-08 22:58:27.710 | 9999-12-31 00:00:00.000 |      0 |
+-------+-------------------------+-------------------------+--------+
gaps-and-islands group-by date tsql sql-server
2 Answers

By using lag to detect the change in status, and then suming the change in status we can group by this sum to give the grouping required.

declare @Test table (ITEM varchar(24), FROM_DT date, TO_DT date, [STATUS] bit)

INSERT INTO @test VALUES  ('ITEM1','2020-01-02 22:57:01.200','2020-01-07 22:54:52.930','0');
INSERT INTO @test VALUES  ('ITEM1','2020-01-07 22:57:21.950','2020-02-03 22:54:30.500','0');
INSERT INTO @test VALUES  ('ITEM1','2020-02-03 22:58:21.180','2020-03-02 22:54:27.253','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-02 22:56:30.737','2020-03-18 17:21:23.390','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-18 17:21:23.403','2020-03-19 09:05:38.060','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-19 09:05:38.063','2020-03-19 13:57:03.567','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-19 13:57:03.570','2020-03-19 23:01:41.403','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-19 23:03:49.900','2020-03-20 23:02:25.437','0');
INSERT INTO @test VALUES  ('ITEM1','2020-03-20 23:04:53.610','2020-04-01 22:59:39.220','0');
INSERT INTO @test VALUES  ('ITEM1','2020-04-01 23:01:45.620','2020-05-01 22:59:09.153','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-01 23:01:11.980','2020-05-14 14:30:21.930','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-14 14:30:21.930','2020-05-14 22:57:24.753','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-14 22:59:17.623','2020-05-15 17:48:34.000','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-15 17:48:35.000','2020-05-15 22:57:15.923','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-15 22:59:11.933','2020-05-16 22:54:31.750','1');
INSERT INTO @test VALUES  ('ITEM1','2020-05-16 22:56:26.793','2020-05-18 22:55:01.050','1');
INSERT INTO @test VALUES  ('ITEM1','2020-05-18 23:00:23.103','2020-05-21 22:55:24.400','0');
INSERT INTO @test VALUES  ('ITEM1','2020-05-21 22:57:01.723','2020-06-01 23:00:21.823','0');
INSERT INTO @test VALUES  ('ITEM1','2020-06-01 23:03:12.467','2020-06-08 22:55:20.393','0');
INSERT INTO @test VALUES  ('ITEM1','2020-06-08 22:58:27.710','9999-12-31 00:00:00.000','0');

select ITEM, min(FROM_DT), max(TO_DT), [STATUS]
from (
  select *
    , sum(case when coalesce(lag,0) <> [STATUS] then 1 else 0 end) over (order by FROM_DT, TO_DT) GroupBy
  from (
    select *
      , lag([STATUS]) over (order by FROM_DT) lag
    from @Test
  ) X
) Y
group by ITEM, GroupBy, [STATUS]
order by ITEM, GroupBy;

Gives:

ITEM    FROM_DT                 TO_DT                   STATUS
ITEM1   2020-01-02 22:57:01.200 2020-05-15 22:57:15.923 0
ITEM1   2020-05-15 22:59:11.933 2020-05-18 22:55:01.050 1
ITEM1   2020-05-18 23:00:23.103 9999-12-31 00:00:00.000 0

If you are interested in seeing how it works then just run:

select *
  , sum(case when coalesce(lag,0) <> [STATUS] then 1 else 0 end) over (order by FROM_DT, TO_DT) GroupBy
from (
  select *
    , lag([STATUS]) over (order by FROM_DT) lag
  from @Test
) X
order by ITEM, FROM_DT, TO_DT
user_11274280

Thanks for posting the missing information (DDL+DML),

Please check if the following solve your needs

;With MyCTE as (
    SELECT 
        ITEM, FROM_DT, TO_DT, EXCL
        , MyGROUP = ROW_NUMBER() OVER (ORDER BY FROM_DT) - RANK() OVER (PARTITION BY EXCL ORDER BY FROM_DT)  
    FROM AH_TEMP
)
SELECT ITEM, MIN(FROM_DT), MAX(TO_DT), EXCL as [STATUS]
FROM MyCTE
GROUP BY ITEM, EXCL, MyGROUP
ORDER BY MIN(FROM_DT)
GO
user_44219440
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