Condition for MAX(Booking) within a specific period - sql

Question

I have a query that is looping between core working hours(7:30-16:30).
This query returns the most recent bookings per group till date but I can't seem to figure out the condition to make sure the most recent returned was that recorded as of the loop time,
i.e at 07:30 today, the most recent bookings from groups F01-F03 were ... regardless of the date the booking was recorded.
My query looks like this at the moment:
DECLARE #ALLBOOKINGS TABLE (BOOKING_GRP NVARCHAR(3), BOOKING_DATE DATETIME)
DECLARE #MAX_BACKDATE DATE = dateadd(DAY,datediff(DAY,0,getdate())-5,0),
#CURRENT_TIME TIME(0) = GETDATE(),
#START_TIME TIME(0) = '07:30:00';
BEGIN
INSERT INTO #ALLBOOKINGS
SELECT BOOKING_GRP, BOOKING_DATE
FROM TABLE1
WHERE BOOKING_DATE >= #MAX_BACKDATE
END
WHILE (#START_TIME <= #CURRENT_TIME)
BEGIN
SELECT *
FROM #ALLBOOKINGS AS T1
WHERE BOOKING_DATE = (SELECT MAX(BOOKING_DATE) FROM #ALLBOOKINGS WHERE BOOKING_GRP = T1.BOOKING_GRP)
--AND
--cast(BOOKING_DATE as time(0)) > #START_TIME AND cast(BOOKING_DATE as time(0)) < #CURRENT_TIME <<<<<<<<<<<<<<<<< this does not work, only returns max till now
SET #START_TIME = DATEADD(MINUTE,10,#START_TIME) END
Table:
+-------+-----------+-----------+-------------+-----------+-------------+
| BOOKING_GRP | BOOKING_DATE | #START_TIME |
+-------+-----------+-----------+-------------+-----------+-------------+
| F01 | 2018-12-10 11:48:50.363 | 07:30:00 |
| F02 | 2018-12-10 11:22:06.367 | 07:30:00 |
| F03 | 2018-12-10 11:21:14.240 | 07:30:00 |
+-------+-----------+-----------+-------------+-----------+-------------+
FAKE DATA - CURRENT RESULT
+-------+-----------+-----------+-------------+-----------+-------------+
| BOOKING_GRP | BOOKING_DATE | #START_TIME |
+-------+-----------+-----------+-------------+-----------+-------------+
| F01 | 2018-12-07 10:34:50.363 | 07:30:00 |
| F02 | 2018-12-10 12:32:06.367 | 07:30:00 |
| F03 | 2018-12-06 11:37:14.240 | 07:30:00 |
+-------+-----------+-----------+-------------+-----------+-------------+
EXPECTED RESULT - WITHIN THE LAST 5 DAYS, THE MOST RECENT BOOKINGS MADE PER GROUP AS OF 07:30 TODAY

Answer 1

I'm not completely sure I understand the question, but you could give the following query a shot:
SELECT Booking_Group, MAX (Booking_Date) AS MaxDate
FROM SomeTable AS ST
WHERE Booking_Date BETWEEN DATEADD (MINUTE, 30, DATEADD (HH, 7, CAST (CAST (GETDATE() AS DATE) AS DATETIME)) ) AND GETDATE()
GROUP BY Booking_Group

Answer 2

There is no reason to loop.
declare #start datetime = '20180101'
,#end datetime = getdate()
select BOOKING_GRP,max(BOOKING_DATE) as LATEST_BOOKING_DATE
from Table1
where BOOKING_DATE between #start and #end
group by BOOKING_GRP

Answer 3

Solved by adding DATE to the while condition
DECLARE #STARTTIME dateTIME = dateadd(day, datediff(day, 0, getdate()), 0) + '07:30',
#CURRENTTIME DATETIME= GETDATE()
WHILE (#START_TIME <= #CURRENT_TIME)
BEGIN
SELECT *
FROM #ALLBOOKINGS AS T1
WHERE BOOKING_DATE = (SELECT MAX(BOOKING_DATE) FROM #ALLBOOKINGS WHERE BOOKING_GRP = T1.BOOKING_GRP
AND DATE_BOOKED < #STARTTIME
)
SET #START_TIME = DATEADD(MINUTE,10,#START_TIME) END