Creating a monthly report in T-SQL - sql-server

Question

I have a table with the following columns
CaseID
DateLogged
CompletionDate
I am trying to create a monthly stock report.
I need to identify monthly which cases are New, current and Completed each month
for instance, All cases logged only in August are new cases while all cases completed in august would show completed and all cases logged that are not completed will be current.
DROP TABLE IF EXISTS #temptable
-- Create date variables
SET dateformat ymd
DECLARE #datefrom datetime = CONVERT(DATETIME, '2019-04-01 00:00:00', 121)
DECLARE #dateto datetime = (SELECT CAST(DATEADD(DAY, -DAY(GETDATE()), GETDATE()) AS date))
-- Recursive date table creation
;WITH monthserial AS
(
SELECT #datefrom AS monthdate
UNION ALL
SELET DATEADD(MONTH, 1, monthdate)
FROM monthserial
WHERE monthdate < #dateto
)
SELECT MN.*
INTO #temptable
FROM monthserial MN
SELECT * FROM MainTable VW
CROSS JOIN #temptable TBL
WHERE DateLogged <= monthdate) test

Answer 1

You will need to use case-when for your situation:
select CaseID,
case
when not (CompletionDate is null) then 'Completed'
when DateLogged >= #input then 'New'
else 'Current'
end
from yourtable
order by DateLogged;
EDIT
Since we are interested about the last entry, we can add a where clause, like this:
select CaseID,
case
when not (CompletionDate is null) then 'Completed'
when DateLogged >= #input then 'New'
else 'Current'
end
from yourtable
where not exists (
select 1
from yourtable inner
where inner.CaseID = yourtable.CaseID and inner.CompletionDate < yourtable.CompletionDate
)
order by DateLogged;