How to find values between date ranges Power BI? - sql

Question

I need help to understand a thing.
I have a table that uses slow changing dimension, with start and end date and indicator if it is active or not:
Type
start
end
value
active
A
0001/01/01
9999/12/31
10
1
B
2015/03/18
2016-06-25
4
0
B
2016-06-25
9999/12/31
7
1
C
2017-05-07
9999/12/31
8
1
I need to connect this table to a report in power bi and fetch the respective value in a line graph that brings the values by month.
Something like this:
I am using a report connect to SSAS through Direct Query. I am able to create a view with the new structure to connect to my cube.
How can I get this result using a table with this structure.
Thanks for the help!
I thought about creating a table with a value for each month, but as you can see, I have dates ranging from 0001-01-01 to 9999-12-31. (To be honest, I don't really know how to do that either).

Answer 1

Based on the chart, assume that date range is 2016-04 ~ 2017-12, so
Generate a month dimension for the above date range
Cross join month dimension and the give slow changing dimension slo_dim and get value in effective period
Draw a line chart based on the result from step 2
with cte_month (year_month, n) as (
select cast('2016-04-01' as date), 1
union all
select dateadd(month, 1, year_month), n+1
from cte_month
where n < 21)
select d.type,
m.year_month,
d.value
from cte_month m, slo_dim d
where m.year_month between d.start_dt and d.end_dt
order by d.type, m.year_month;
Result:
type|year_month|value|
----+----------+-----+
A |2016-04-01| 10|
A |2016-05-01| 10|
A |2016-06-01| 10|
A |2016-07-01| 10|
A |2016-08-01| 10|
A |2016-09-01| 10|
A |2016-10-01| 10|
A |2016-11-01| 10|
A |2016-12-01| 10|
A |2017-01-01| 10|
A |2017-02-01| 10|
A |2017-03-01| 10|
A |2017-04-01| 10|
A |2017-05-01| 10|
A |2017-06-01| 10|
A |2017-07-01| 10|
A |2017-08-01| 10|
A |2017-09-01| 10|
A |2017-10-01| 10|
A |2017-11-01| 10|
A |2017-12-01| 10|
B |2016-04-01| 4|
B |2016-05-01| 4|
B |2016-06-01| 4|
B |2016-07-01| 7|
B |2016-08-01| 7|
B |2016-09-01| 7|
B |2016-10-01| 7|
B |2016-11-01| 7|
B |2016-12-01| 7|
B |2017-01-01| 7|
B |2017-02-01| 7|
B |2017-03-01| 7|
B |2017-04-01| 7|
B |2017-05-01| 7|
B |2017-06-01| 7|
B |2017-07-01| 7|
B |2017-08-01| 7|
B |2017-09-01| 7|
B |2017-10-01| 7|
B |2017-11-01| 7|
B |2017-12-01| 7|
C |2017-06-01| 8|
C |2017-07-01| 8|
C |2017-08-01| 8|
C |2017-09-01| 8|
C |2017-10-01| 8|
C |2017-11-01| 8|
C |2017-12-01| 8|