My count CTE returning blanks, how can I get it return as 0? - sql

Question

CTE created to count the number of days left from today's date to end of current month. So my report for today (30 March 2021) did not count tomorrow's date 31 March 2021.
declare #DespatchTo Date = '03-30-2021'
WITH mycte AS
(
SELECT CAST(Convert(date,getdate()) AS DATETIME) DateValue
UNION ALL
SELECT DateValue + 1
FROM mycte
WHERE DateValue < DATEADD(d, -1, DATEADD(m, DATEDIFF(m, 0, #DespatchTo) + 1, 0)) --03-31-2021
)
SELECT SUN.Count as SunCount, SAT.Count as SatCount, WK.Count as WeekCount
FROM
(SELECT count(*) as Count
FROM mycte
WHERE DatePart("w",DateValue) = 1
group by DatePart("w",DateValue))
As SUN,
(SELECT count(*) as Count
FROM mycte
WHERE DatePart("w",DateValue) = 7
group by DatePart("w",DateValue))
As SAT,
(SELECT distinct SUM(COUNT(*)) OVER() AS Count
FROM mycte
WHERE DatePart("w",DateValue) > 1 AND DatePart("w",DateValue) < 7
group by DatePart("w",DateValue))
As WK
Which returns blank/null results. How can I return as 0?

Answer 1

here is what you need to do:
;WITH mycte AS (
SELECT GETDATE() DateValue
UNION ALL
SELECT DateValue + 1
FROM mycte
WHERE DateValue < EOMONTH(GETDATE())
)
select
count(case when datepart(dw, DateValue) = 1 then 1 end) SUN
, count(case when datepart(dw, DateValue) = 7 then 1 end) SAT
, count(case when datepart(dw, DateValue) between 2 and 6 then 1 end) WK
from mycte
if you want to exclude today, you can adjust cte :
;WITH mycte AS (
SELECT GETDATE() + 1 DateValue
WHERE GETDATE() <> EOMONTH(GETDATE())
UNION ALL
SELECT DateValue + 1
FROM mycte
WHERE DateValue < EOMONTH(GETDATE())
)
select
count(case when datepart(dw, DateValue) = 1 then 1 end) SUN
, count(case when datepart(dw, DateValue) = 7 then 1 end) SAT
, count(case when datepart(dw, DateValue) between 2 and 6 then 1 end) WK
from mycte