SQL: Sum Only Certain Rows Depending on Start and End Date - sql

Question

I have two tables: The 1st table contains a unique identifier (UI). Each unique identifier has a column containing a start date (yyyy-mm-dd), and a column containing an end date (yyyy-mm-dd). The 2nd table contains the temperature for each day, with separate columns for the month, day, year and temperature. I would like to join those tables and get the compiled temperature for each unique identifier; however I would the compiled temperature to only include the days from the second table that fall between start and end dates from the 1st table.
For example, if one record has a start_date of 12/10/15 and an end date of 12/31/15, I would like to have a column containing compiled temperatures for the 10th-31s. If the next record has a start date 12/3/15-12/17/15, I'd like the column next to it to show the compiled temperature for the 3rd-17th. I'll include the query I have so far, but it is not too helpful because I have not really gotten very far:
; with Temps as (
select MONTH, DAY, YEAR, Temp
from Temperatures
where MONTH = 12
and YEAR = 2016
)
Select UI, start_date, end_date, location, SUM(temp)
from Table1 t1
Inner join Temps
on temps.month = month(t1.start_date)
I appreciate any help you might be able to give. Let me know I need to elaborate on anything.
Table 1
UI Start_Date End_Date
2080 12/5/2015 12/31/2015
1266 12/1/2015 12/31/2015
1787 12/17/2015 12/28/2015
1621 12/3/2015 12/20/2015
1974 12/10/2015 12/12/2015
1731 12/25/2015 12/31/2015
Table 2
Month Day Year Temp
12 1 2016 34
12 2 2016 32
12 3 2016 35
12 4 2016 37
12 5 2016 32
12 6 2016 30
12 7 2016 31
12 8 2016 36
12 9 2016 48
12 10 2016 42
12 11 2016 33
12 12 2016 41
12 13 2016 31
12 14 2016 29
12 15 2016 46
12 16 2016 48
12 17 2016 38
12 18 2016 29
12 19 2016 45
12 20 2016 37
12 21 2016 48
12 22 2016 46
12 23 2016 44
12 24 2016 45
12 25 2016 35
12 26 2016 44
12 27 2016 29
12 28 2016 38
12 29 2016 29
12 30 2016 35
12 31 2016 40
Table 3 (Expected Result)
UI Start_Date End_Date Compiled Temp
2080 12/5/2015 12/31/2015 1101
1266 12/1/2015 12/31/2015 1167
1787 12/17/2015 12/28/2015 478
1621 12/3/2015 12/20/2015 668
1974 12/10/2015 12/12/2015 126
1731 12/25/2015 12/31/2015 250

Answer 1

You could do something like this:
; WITH temps AS (
SELECT CONVERT(DATE, CONVERT(CHAR(4), [YEAR]) + '-' + CONVERT(CHAR(2), [MONTH]) + '-' + CONVERT(VARCHAR(2), [DAY])) [TDate], [Temp]
FROM Temperatures
WHERE [MONTH] = 12
AND [YEAR] = 2015
)
SELECT [UI], [start_date], [end_date]
, (SELECT SUM([temp])
FROM temps
WHERE [TDate] BETWEEN T1.[start_date] AND T1.[end_date]) [Compiled Temp]
FROM Table1 T1
No need for a join.

Answer 2

You can do a simple join of the two tables as well. You don't need to use a CTE.
--TEST DATA
if object_id('Table1','U') is not null
drop table Table1
create table Table1 (UI int, Start_Date date, End_Date date)
insert Table1
values
(2080,'12/05/2015','12/31/2015'),
(1266,'12/01/2015','12/31/2015'),
(1787,'12/17/2015','12/28/2015'),
(1621,'12/03/2015','12/20/2015'),
(1974,'12/10/2015','12/12/2015'),
(1731,'12/25/2015','12/31/2015')
if object_id('Table2','U') is not null
drop table Table2
create table Table2 (Month int, Day int, Year int, Temp int)
insert Table2
values
(12,1, 2015,34),
(12,2, 2015,32),
(12,3, 2015,35),
(12,4, 2015,37),
(12,5, 2015,32),
(12,6, 2015,30),
(12,7, 2015,31),
(12,8, 2015,36),
(12,9, 2015,48),
(12,10,2015,42),
(12,11,2015,33),
(12,12,2015,41),
(12,13,2015,31),
(12,14,2015,29),
(12,15,2015,46),
(12,16,2015,48),
(12,17,2015,38),
(12,18,2015,29),
(12,19,2015,45),
(12,20,2015,37),
(12,21,2015,48),
(12,22,2015,46),
(12,23,2015,44),
(12,24,2015,45),
(12,25,2015,35),
(12,26,2015,44)
--AGGREGATE TEMPS
select t1.Start_Date, t1.End_Date, avg(t2.temp) AvgTemp, sum(t2.temp) CompiledTemps
from table1 t1
join table2 t2 ON t2.Year between datepart(year, t1.Start_Date) and datepart(year, t1.End_Date)
and t2.Month between datepart(month,t1.Start_Date) and datepart(month,t1.End_Date)
and t2.Day between datepart(day, t1.Start_Date) and datepart(day, t1.End_Date)
group by t1.Start_Date, t1.End_Date