Whats an alternative to using a cursor as per this example in t-sql - tsql

Question

I’m new to SQL (specifically t-sql and microsoft SQL Server 2008 R2) and had a problem my boss advised me to fix using a cursor. The problem being taking records (equating to shifts entered into a roster) that are over an hour (but divisible by an hour) and effectively splitting them into multiple shift records of an hour each for a report.
Below you can see the section of the query re the cursor logic that I used. My understanding is that cursors are very inefficient and frowned upon – but neither my boss nor myself could identify an alternative solution to this problem.
Can anyone demonstrate a way we could do this without cursors?
Open Curs;
FETCH NEXT FROM Curs INTO #ClientID, #RDNSID, #SvceType, #SDate, #ClientNm, #CHours, #StaffNm, #Package
WHILE (##Fetch_Status = 0)
BEGIN
SET #Hour = 60
SET #Num = #Chours
IF (#Num % 60 = 0)
BEGIN
WHILE (#Num >= 60)
BEGIN
INSERT INTO #ASRTable VALUES (#ClientID, #RDNSID, #SvceType, #SDate, #ClientNm, #Hour, #StaffNm, #Package)
SET #Num = #Num - 60
SET #SDate = DATEADD(HH, 1, #SDate)
END
END
ELSE
BEGIN
SET #Hour = 'INVALID SHIFT'
INSERT INTO #ASRTable VALUES (#ClientID, #RDNSID, #SvceType, #SDate, #ClientNm, #Hour, #StaffNm, #Package)
END
FETCH NEXT FROM Curs INTO #ClientID, #RDNSID, #SvceType, #SDate, #ClientNm, #CHours, #StaffNm, #Package
END
SELECT * FROM #ASRTable
DROP TABLE #ASRTable
CLOSE Curs
DEALLOCATE Curs

Answer 1

Well, you haven't given us sample data or expected results, but I think this follows the same logic:
declare #t table (
SDate datetime not null,
Chours int not null --Curiously, will store a number of minutes?
)
insert into #t (SDate,Chours) values ('2012-12-19T10:30:00',120),('2012-12-18T09:00:00',60),('2012-12-17T08:00:00',90)
;with shifts as (
select SDate,Chours,'60' as Hour from #t where Chours % 60 = 0
union all
select DATEADD(hour,1,SDate),CHours - 60,'60' from shifts where Chours > 0
)
select SDate,Hour from shifts
union all
select SDate,'Invalid Shift' from #t where CHours % 60 <> 0
Result:
SDate Hour
----------------------- -------------
2012-12-19 10:30:00.000 60
2012-12-18 09:00:00.000 60
2012-12-18 10:00:00.000 60
2012-12-19 11:30:00.000 60
2012-12-19 12:30:00.000 60
2012-12-17 08:00:00.000 Invalid Shift
Of course, I don't have all of your other columns, since I have no idea what they're meant to be.