StackOverflow - Question

	A	B	C	D
1	date	serie_1	serie_2	client
2	1/1/2019	2	6	Client A
3	1/2/2019	1	6	Client A
4	1/3/2019	5	8	Client B
5	1/4/2019	3	8	Client A
6	1/5/2019	8	2	Client B
7	1/6/2019	7	5	Client A
8	1/7/2019	5	5	Client B
9	1/8/2019	6	6	Client A
10	1/9/2019	4	3	Client B
11	1/10/2019	4	10	Client A
12	1/11/2019	5	8	Client B
13	1/12/2019	5	8	Client A
14	1/13/2019	2	5	Client B
15	1/14/2019	9	8	Client A
16	1/15/2019	4	1	Client B
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