MySQL 5.7

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create table groups ( id int,  grpid int , changeDate date,  userid int,  pct double ,  hobby int );
SELECT * from groups;
insert into groups(id , grpid , changeDate  ,userid  ,pct  ,hobby ) values
(1 ,  1     ,'2020-01-01',  1  ,     1  ,  1   ),
(2  , 1      ,'2020-01-02',  1   ,    1   , 2    ),
(3  , 1      ,'2020-01-03',  1   ,    1   , 1    ),
(4  , 2      ,'2020-01-01',  1   ,    0.5 , 1    ),
(5  , 2      ,'2020-01-01',  2   ,    0.5 , 2    ),
(6  , 2      ,'2020-01-02',  1   ,    0.5 , 1    ),
(7  , 2      ,'2020-01-02',  2   ,    0.5 , 3    ),
(8  , 3      ,'2020-01-01',  1   ,    0.5 , 1    ),
(9  , 3      ,'2020-01-01',  2   ,    0.5 , 2    ),
(10 , 3      ,'2020-01-02',  1   ,    0.4 , 1    ),
(11 , 3      ,'2020-01-02',  2   ,    0.6 , 2    ),
(12 , 4      ,'2020-01-01',  1   ,    0.6 , 1    ),
(13 , 4      ,'2020-01-01',  2   ,    0.4 , 2    ),
(14 , 4      ,'2020-01-02',  1   ,    0.6 , 1    ),
(15 , 4      ,'2020-01-02',  2   ,    0.4 , 2    ),
(16 , 5      ,'2020-01-01',  1   ,    0.2 , 2    ),
(17 , 5      ,'2020-01-01',  2   ,    0.5 , 1    ),
(18 , 5      ,'2020-01-01',  3   ,    0.3 , 2    ),
(19 , 6      ,'2020-01-01',  1   ,    0.3 , 2    ),
(20 , 6      ,'2020-01-01',  2   ,    0.5 , 1    ),
(21 , 6      ,'2020-01-01',  3   ,    0.2 , 2    ),
(22 , 6      ,'2020-02-01',  1   ,    0.2 , 2    ),
(23 , 6      ,'2020-02-01',  2   ,    0.5 , 1    ),
(24 , 6      ,'2020-02-01',  3   ,    0.3 , 2    ),
(25 , 6      ,'2020-03-01',  1   ,    0.3 , 2    ),
(26 , 6      ,'2020-03-01',  2   ,    0.3 , 1    ),
(27 , 6      ,'2020-03-01',  3   ,    0.4 , 2    ),
(28 , 7      ,'2020-01-01',  1   ,    0.3 , 2    ),
(29 , 7      ,'2020-01-01',  2   ,    0.5 , 1    ),
(30 , 7      ,'2020-01-01',  3   ,    0.2 , 2    ),
(31 , 7      ,'2020-02-01',  1   ,    0.3 , 2    ),
(32 , 7      ,'2020-02-01',  2   ,    0.5 , 1    ),
(33 , 7      ,'2020-02-01',  3   ,    0.2 , 2    ),
(34 , 7      ,'2020-03-01',  1   ,    0.3 , 2    ),     
(35 , 7      ,'2020-03-01',  2   ,    0.3 , 1    ),  
(36 , 7      ,'2020-03-01',  3    ,  0.4 , 2    );
SELECT * from groups;


id
grpid
changeDate
userid
pct
hobby


1
1
2020-01-01
1
1
1

2
1
2020-01-02
1
1
2

3
1
2020-01-03
1
1
1

4
2
2020-01-01
1
0.5
1

5
2
2020-01-01
2
0.5
2

6
2
2020-01-02
1
0.5
1

7
2
2020-01-02
2
0.5
3

8
3
2020-01-01
1
0.5
1

9
3
2020-01-01
2
0.5
2

10
3
2020-01-02
1
0.4
1

11
3
2020-01-02
2
0.6
2

12
4
2020-01-01
1
0.6
1

13
4
2020-01-01
2
0.4
2

14
4
2020-01-02
1
0.6
1

15
4
2020-01-02
2
0.4
2

16
5
2020-01-01
1
0.2
2

17
5
2020-01-01
2
0.5
1

18
5
2020-01-01
3
0.3
2

19
6
2020-01-01
1
0.3
2

20
6
2020-01-01
2
0.5
1

21
6
2020-01-01
3
0.2
2

22
6
2020-02-01
1
0.2
2

23
6
2020-02-01
2
0.5
1

24
6
2020-02-01
3
0.3
2

25
6
2020-03-01
1
0.3
2

26
6
2020-03-01
2
0.3
1

27
6
2020-03-01
3
0.4
2

28
7
2020-01-01
1
0.3
2

29
7
2020-01-01
2
0.5
1

30
7
2020-01-01
3
0.2
2

31
7
2020-02-01
1
0.3
2

32
7
2020-02-01
2
0.5
1

33
7
2020-02-01
3
0.2
2

34
7
2020-03-01
1
0.3
2

35
7
2020-03-01
2
0.3
1

36
7
2020-03-01
3
0.4
2

id	grpid	changeDate	userid	pct	hobby
1	1	2020-01-01	1	1	1
2	1	2020-01-02	1	1	2
3	1	2020-01-03	1	1	1
4	2	2020-01-01	1	0.5	1
5	2	2020-01-01	2	0.5	2
6	2	2020-01-02	1	0.5	1
7	2	2020-01-02	2	0.5	3
8	3	2020-01-01	1	0.5	1
9	3	2020-01-01	2	0.5	2
10	3	2020-01-02	1	0.4	1
11	3	2020-01-02	2	0.6	2
12	4	2020-01-01	1	0.6	1
13	4	2020-01-01	2	0.4	2
14	4	2020-01-02	1	0.6	1
15	4	2020-01-02	2	0.4	2
16	5	2020-01-01	1	0.2	2
17	5	2020-01-01	2	0.5	1
18	5	2020-01-01	3	0.3	2
19	6	2020-01-01	1	0.3	2
20	6	2020-01-01	2	0.5	1
21	6	2020-01-01	3	0.2	2
22	6	2020-02-01	1	0.2	2
23	6	2020-02-01	2	0.5	1
24	6	2020-02-01	3	0.3	2
25	6	2020-03-01	1	0.3	2
26	6	2020-03-01	2	0.3	1
27	6	2020-03-01	3	0.4	2
28	7	2020-01-01	1	0.3	2
29	7	2020-01-01	2	0.5	1
30	7	2020-01-01	3	0.2	2
31	7	2020-02-01	1	0.3	2
32	7	2020-02-01	2	0.5	1
33	7	2020-02-01	3	0.2	2
34	7	2020-03-01	1	0.3	2
35	7	2020-03-01	2	0.3	1
36	7	2020-03-01	3	0.4	2