SQL - return all days of last month - sql

Question

I have a query that will return the total number of calls I received each day of last month for a queue. if no calls it will return zero for that day. However when running this report for for December of 2013 the results are blank. It appears to be due to the fact the query is returning the dates with the year of 2014 instead of 2013. How can I adjust the query so the date is 12/01/2013, etc.
DECLARE #pMnth int,#pYr int,#pQueue varchar
SET #pMnth = '12'
SET #pYr = '2013'
SET #pQueue = 'Queue Name'
;
WITH
CTE_Days AS
(
SELECT DATEADD(month, #pMnth, DATEADD(month, -MONTH(GETDATE()), DATEADD(day, -DAY(GETDATE()) + 1, CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME)))) as Dt
UNION ALL
SELECT DATEADD(day, 1, Dt)
FROM CTE_Days
WHERE Dt < DATEADD(day, -1, DATEADD(month, 1, DATEADD(month, #pMnth, DATEADD(month, -MONTH(GETDATE()), DATEADD(day, -DAY(GETDATE()) + 1, CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME))))))
)
SELECT tbl1.Dt,ISNULL(Calls,0) AS Calls
FROM CTE_Days tbl1
LEFT JOIN(
SELECT CAST(clmdate AS Date) AS ClDt,COUNT(*) AS Calls
FROM dbo.tblcalls
WHERE DATEPART(yyyy,clmdate) = #pYr
AND DATEPART(mm,clmdate) = #pMnth
AND clmqueue = #pQueue
GROUP BY CAST(clmdate AS Date)
) tbl2 ON tbl1.Dt = tbl2.ClDt

Answer 1

Not really sure what you're trying to do with all the variables, but if you want the first day of last month:
SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())-1, 0) -- < SQL 2012
SELECT DATEADD(day,1,EOMONTH(GETDATE(),-2)) -- SQL 2012
Last day of last month:
SELECT DATEADD(day,-1,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)) -- < SQL 2012
SELECT EOMONTH(GETDATE(),-1) -- SQL 2012
In your code (assuming you're not on 2012):
DECLARE #pMnth int,#pYr int,#pQueue varchar
SET #pMnth = '12'
SET #pYr = '2013'
SET #pQueue = 'Queue Name'
;
WITH
CTE_Days AS
(
SELECT DATEADD(month, DATEDIFF(month, 0, GETDATE())-1, 0) as Dt
UNION ALL
SELECT DATEADD(day, 1, Dt)
FROM CTE_Days
WHERE Dt < DATEADD(day,-1,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))
)
SELECT tbl1.Dt,ISNULL(Calls,0) AS Calls
FROM CTE_Days tbl1
LEFT JOIN(
SELECT CAST(clmdate AS Date) AS ClDt,COUNT(*) AS Calls
FROM dbo.tblcalls
WHERE DATEPART(yyyy,clmdate) = #pYr
AND DATEPART(mm,clmdate) = #pMnth
AND clmqueue = #pQueue
GROUP BY CAST(clmdate AS Date)
) tbl2 ON tbl1.Dt = tbl2.ClDt
Update:
To incorporate your variables, I would change the month and year variables to strings, and replace GETDATE() with a date variable:
DECLARE #pMnth CHAR(2)
,#pYr CHAR(4)
,#pQueue VARCHAR(MAX)
,#dt DATE
SET #pMnth = '12'
SET #pYr = '2013'
SET #pQueue = 'Queue Name'
SET #dt = CAST(#pYr+RIGHT('0'+#pMnth,2)+'01' AS DATE)
WITH
CTE_Days AS
(
SELECT DATEADD(month, DATEDIFF(month, 0, #dt)-1, 0) as Dt
UNION ALL
SELECT DATEADD(day, 1, Dt)
FROM CTE_Days
WHERE Dt < DATEADD(day,-1,DATEADD(month, DATEDIFF(month, 0, #dt), 0))
)
SELECT tbl1.Dt,ISNULL(Calls,0) AS Calls
FROM CTE_Days tbl1
LEFT JOIN(
SELECT CAST(clmdate AS Date) AS ClDt,COUNT(*) AS Calls
FROM dbo.tblcalls
WHERE DATEPART(yyyy,clmdate) = #pYr
AND DATEPART(mm,clmdate) = #pMnth
AND clmqueue = #pQueue
GROUP BY CAST(clmdate AS Date)
) tbl2 ON tbl1.Dt = tbl2.ClDt