Returning column with count of 0 - sql

Question

I have a query that looks up a list of documents depending on their department and their status.
DECLARE #StatusIds NVARCHAR(MAX) = '1,2,3,4,5';
DECLARE #DepartmentId NVARCHAR(2) = 'IT';
SELECT ILDPST.name,
COUNT(*) AS TodayCount
FROM dbo.TableA ILDP
LEFT JOIN dbo.TableB ILDPS ON ILDPS.IntranetLoanDealPreStateId = ILDP.IntranetLoanDealPreStateId
LEFT JOIN dbo.TableC ILDPST ON ILDPST.IntranetLoanDealPreStateTypeId = ILDPS.CurrentStateTypeId
WHERE (ILDP.CreatedByDepartmentId = #DepartmentId OR #DepartmentId IS NULL)
AND ILDPS.CurrentStateTypeId IN (
SELECT value
FROM dbo.StringAsIntTable(#StatusIds)
)
GROUP BY ILDPST.name;
This returns the results:
However, I'd also like to be able to return statuses where the TodayCount is equal to 0 (i.e. any status with an id included in #StatusIds should be returned, regardless of TodayCount).
I've tried messing with some unions / joins / ctes but I couldn't quite get it to work. I'm not much of an SQL person so not sure what else to provide that could be useful.
Thanks!

Answer 1

If you want to have all the records from TableC you need to left join all other tables to it, not left join it to the other tables. Also it's best to INNER JOIN the filtering table you create from #StatusIds rather then apply it through INclause. Try this:
DECLARE #StatusIds NVARCHAR(MAX) = '1,2,3,4,5';
DECLARE #DepartmentId NVARCHAR(2) = 'IT';
SELECT ILDPST.Name, COUNT(ILDP.IntranetLoanDealPreStateId) AS TodayCount
FROM (SELECT DISTINCT value FROM dbo.StringAsIntTable(#StatusIds)) StatusIds
INNER JOIN dbo.TableC ILDPST
ON ILDPST.IntranetLoanDealPreStateTypeId = StatusIds.value
LEFT JOIN dbo.TableB ILDPS
ON ILDPS.CurrentStateTypeId = ILDPST.IntranetLoanDealPreStateTypeId
LEFT JOIN dbo.TableA ILDP
ON ILDP.IntranetLoanDealPreStateId = ILDPS.IntranetLoanDealPreStateId
AND (ILDP.CreatedByDepartmentId = #DepartmentId OR #DepartmentId IS NULL)
GROUP BY ILDPST.Name;

Answer 2

Try this instead:
DECLARE #StatusIds NVARCHAR(MAX) = '1,2,3,4,5';
DECLARE #DepartmentId NVARCHAR(2) = 'IT';
SELECT ILDPST.name,
COUNT(ILDP.IntranetLoanDealPreStateId) AS TodayCount
FROM
dbo.TableC ILDPST
LEFT JOIN
dbo.TableB ILDPS ON ILDPST.IntranetLoanDealPreStateTypeId = ILDPS.CurrentStateTypeId
LEFT JOIN
dbo.TableA ILDP ON ILDPS.IntranetLoanDealPreStateId = ILDP.IntranetLoanDealPreStateId
AND (ILDP.CreatedByDepartmentId = #DepartmentId OR #DepartmentId IS NULL)
WHERE
ILDPST.IntranetLoanDealPreStateTypeId
IN (
SELECT value
FROM dbo.StringAsIntTable(#StatusIds)
)
GROUP BY ILDPST.name;

Answer 3

You could use the following function to create a table value for your status id's.
CREATE FUNCTION [dbo].[SplitString]
(
#myString varchar(max),
#deliminator varchar(2)
)
RETURNS
#ReturnTable TABLE
(
[Part] [varchar](max) NULL
)
AS
BEGIN
Declare #iSpaces int
Declare #part varchar(max)
--initialize spaces
Select #iSpaces = charindex(#deliminator,#myString,0)
While #iSpaces > 0
Begin
Select #part = substring(#myString,0,charindex(#deliminator,#myString,0))
Insert Into #ReturnTable(Part)
Select #part
Select #myString = substring(#mystring,charindex(#deliminator,#myString,0)+ len(#deliminator),len(#myString) - charindex(' ',#myString,0))
Select #iSpaces = charindex(#deliminator,#myString,0)
end
If len(#myString) > 0
Insert Into #ReturnTable
Select #myString
RETURN
END
This can now be used as a table that you can LEFT JOIN to.
DECLARE #StatusIds NVARCHAR(MAX) = '1,2,3,4,5';
SELECT * FROM dbo.SplitString(#StatusIds, ',')

Answer 4

It is not tested but give it a try:
;With Cte ( Value ) As
( Select Distinct Value From dbo.StringAsIntTable( #StatusIds ) )
Select
ILDPST.name,
COUNT(*) AS TodayCount
From
dbo.TableC As ILDPST
Inner Join Cte On ( ILDPST.IntranetLoanDealPreStateTypeId = Cte.Value )
Left Join dbo.TableB As ILDPS On ( ILDPST.IntranetLoanDealPreStateTypeId = ILDPS.CurrentStateTypeId )
Left Join dbo.TableA As ILDP On ( ILDPS.IntranetLoanDealPreStateId = ILDP.IntranetLoanDealPreStateId )
And ( ( ILDP.CreatedByDepartmentId = #DepartmentId ) Or ( #DepartmentId Is Null ) )
Group By
ILDPST.name