Left Outer Join With Date Range Only Not Working As Expected - sql

Question

I originally posted this question here but sadly now I have to dump the mortgage number filter. Which it turns out is a pain.
I'm using the following LOJ query which uses a CTE to generate a range of dates:
Declare #inquiryStartDate DateTime;
Declare #inquiryEndDate DateTime;
SET #inquiryStartDate = '2013-07-01';
SET #inquiryEndDate = '2013-07-31';
With DateRange As (
SELECT ID, Date
FROM d_Dates
WHERE (Date BETWEEN #inquiryStartDate AND #inquiryEndDate)
)
Select DateRange.ID, DateRange.Date,f_MortgageSnapshots.MortgageNumber, f_MortgageSnapshots.Investor_ID
From DateRange
LEFT OUTER JOIN f_MortgageSnapshots On DateRange.ID = f_MortgageSnapshots.SnapshotDate_ID
And I'm getting something like this:
But I want this:
What am I doing wrong? Can't I do a left join between tables in the case?
Quick note, There are just 2 rows in the f_MortgageSnapshots table for mortgage 12345678.
For those who are wondering, here's the d_Dates table:

Answer 1

It looks like d_dates does not contain a row for every possible date within your inquiry date range.
try something like:-
create function [dbo].BuildDataRange
(
#StartDate date,
#EndDate date
)
returns #returntable table
(
ID int,
[Date] date
)
as
begin
while #StartDate<=#EndDate begin
insert into #returntable (ID, [Date]) values (
DATEPART(year,#StartDate)*10000 +
DATEPART(month,#StartDate)*100 +
DATEPART(day,#StartDate),
#StartDate)
set #StartDate=DATEADD(day,1,#StartDate)
end
return
end
go
and then you should be able to:-
Declare #inquiryStartDate DateTime;
Declare #inquiryEndDate DateTime;
SET #inquiryStartDate = '2013-07-01';
SET #inquiryEndDate = '2013-07-31';
select *
from [dbo].BuildDataRange(#inquiryStartDate, #inquiryEndDate) dr
left join f_MortgageSnapshots On dr.ID = f_MortgageSnapshots.SnapshotDate_ID