Se não estiver faltando nada, é isso que você pode tentar em vez do seu loop:
DECLARE
@StartTime time,
@EndTime time;
SET @StartTime = '22:30:00';
SET @EndTime = '00:52:00';
WITH timerange AS (
SELECT
StartTime = CAST(@StartTime AS datetime),
EndTime = DATEADD(
DAY,
CASE WHEN @StartTime > @EndTime THEN 1 ELSE 0 END,
CAST(@EndTime AS datetime)
)
),
hourly AS (
SELECT
n.number,
t.StartTime,
t.EndTime,
HStart = DATEADD(HOUR, DATEDIFF(HOUR, 0, t.StartTime) + n.number , 0),
HEnd = DATEADD(HOUR, DATEDIFF(HOUR, 0, t.StartTime) + n.number + 1, 0)
FROM timerange t
INNER JOIN master..spt_values n
ON n.number BETWEEN 0 AND DATEDIFF(HOUR, t.StartTime, t.EndTime)
WHERE n.type = 'P'
),
hourly2 AS (
SELECT
number,
HStart = CASE WHEN StartTime > HStart THEN StartTime ELSE HStart END,
HEnd = CASE WHEN EndTime < HEnd THEN EndTime ELSE HEnd END
FROM hourly
)
SELECT
StartHour = DATEPART(HOUR , HStart),
StartMinute = DATEPART(MINUTE, HStart),
EndHour = DATEPART(HOUR , HEnd ),
EndMinute = DATEPART(MINUTE, HEnd ),
StartTime = CAST(HStart AS time),
EndTime = CAST(HEnd AS time)
FROM hourly2
ORDER BY number
;
A saída produzida é esta:
StartHour StartMinute EndHour EndMinute StartTime EndTime
----------- ----------- ----------- ----------- ---------------- ----------------
22 30 23 0 22:30:00.0000000 23:00:00.0000000
23 0 0 0 23:00:00.0000000 00:00:00.0000000
0 0 0 52 00:00:00.0000000 00:52:00.0000000
