Report - SQL group by week number and year - tsql

Question

I have a table temperatures with columns mac_address varchar(255), tm datetime,
temperature float.
I'd like to create a report with 3 parameters: mac_address, week_number and year.
The report should show maximum temperature on certain mac_address in certain week_number (01, ... 50, ...) in certain year. There may be more than 1 rows for certain week_number and year...
The SQL Query for the dataset could be something like
select max(temperature), mac_address, tm
from temperatures
group by mac_address
having mac_address = #mac_address and week_number = #week_number and year = #year
Do you know how to construct the query correctly? Maybe I will need 3 more datasets.
For #mac_address parameter it is easy. I will
select distinct mac_address from temperatures
But how can I do it with #week_number and #year parameters? Is the only option to add the values for dropdown list manually?
The possible result may be:
When the user select from the parameters
mac_address 001, week_number 47 and year 2019
max_temperature | tm
27.8 t1
27.8 t2
27.8 t3
Now it returns 3 rows. Most of the time there will be only one row.

Answer 1

From what I understand from your question, you want to dynamically search by weeknumber, mac_address and year returning the highest temperature for each day matching in that range. A query like the following should do what you are after.
declare #macaddress varchar(255) = '2', #WeekNumber int = 36, #year int = 2019
Select
Date = tm,
Temperature = max(temperature)
from
Temps t
where
year(tm)=#year
and mac_address=#macaddress
and datepart(week,tm) = #WeekNumber
group by
tm
If you want the mac_address included in the results, simply add to the Select and Group By sections.
Here's the SQL fiddle with a test setup.

Answer 2

For a data set to build the year parameter you could use something like this, which will get you 10 years. You can expand as needed:
;WITH years AS (
SELECT YEAR(DATEADD(YY,-5,GETDATE())) AS yr
UNION ALL
SELECT yr + 1
FROM years
WHERE yr < YEAR(DATEADD(YY,5,GETDATE()))
)
SELECT *
FROM years
For the weeks parameter you could hard-code them or use something like:
;WITH weeks AS (
SELECT 1 AS wk
UNION ALL
SELECT wk + 1
FROM weeks
WHERE wk < 52
)
SELECT *
FROM weeks
In your main SQL data set you would want to use something like:
select max(temperature), mac_address, tm
from temperatures
where mac_address = #mac_address
and week_number = #week_number
and year = #year
group by mac_address, tm
Edit: remove tm from the SELECT and GROUP BY
select max(temperature), mac_address
from temperatures
where mac_address = #mac_address
and week_number = #week_number
and year = #year
group by mac_address