SQL Multiple record : Time Scheduler - sql

Question

I have problem about combining tables in store procedure.
Note : field "Time" is varchar
First table (tbTime)
Time
08:00:00
08:30:00
09:00:00
09:30:00
10:00:00
10:30:00
11:00:00
11:30:00
12:00:00
12:30:00
13:00:00
13:30:00
14:00:00
14:30:00
15:00:00
15:30:00
16:00:00
16:30:00
17:00:00
17:30:00
18:00:00
18:30:00
19:00:00
19:30:00
20:00:00
Second table (tbClassRsv)
select * from tbclassrsv where transdate='2014-02-05 00:00:00' and status<>'DEL'
transDate time until status studentCode tutor class description userID
2014-02-05 16:48:14 17:48:14 OPN ET-7201 ET-444 ROOM 01 try ADMIN
I want the result with condition schedule like this
Time Student
08:00:00 -
08:30:00 -
09:00:00 -
09:30:00 -
10:00:00 -
10:30:00 -
11:00:00 -
11:30:00 -
12:00:00 -
12:30:00 -
13:00:00 -
13:30:00 -
14:00:00 -
14:30:00 -
15:00:00 -
15:30:00 -
16:00:00 -
16:30:00 ET-7201
17:00:00 ET-7201
17:30:00 ET-7201
18:00:00 ET-7201
18:30:00 -
19:00:00 -
19:30:00 -
20:00:00 -
Thanks for reading or answer ^_^
GBU
I`ve tried this
select t.time,
isnull(
(select c.studentCode
from tbclassrsv c
where c.transdate='2014-02-05 00:00:00'
and c.class='ROOM 01'
and c.status<>'DEL'
and t.time>=c.time
and t.time<=c.until
),'-') [Student]
The result is....
Time Student
08:00:00 -
08:30:00 -
09:00:00 -
09:30:00 -
10:00:00 -
10:30:00 -
11:00:00 -
11:30:00 -
12:00:00 -
12:30:00 -
13:00:00 -
13:30:00 -
14:00:00 -
14:30:00 -
15:00:00 -
15:30:00 -
16:00:00 -
16:30:00 -
17:00:00 ET-7201
17:30:00 ET-7201
18:00:00 -
18:30:00 -
19:00:00 -
19:30:00 -
20:00:00 -

Answer 1

Try this. you were not converting your varchar times to datetime so that your time comparisons would work.
select t.time,
isnull(
(select c.studentCode
from tbClassRsv c
where c.transdate='2014-02-05 00:00:00'
and c.class='ROOM 01'
and c.status<>'DEL'
and DateAdd(MINUTE, 30, Convert(datetime, t.time))>= Convert(datetime, c.time)
and Convert(datetime, t.time) <= Convert(datetime, c.until)
),'-') from [tbTime] t

Answer 2

What you need to do is round c.time down to the nearest 30 minutes interval, and round c.until up to the nearest interval. This way your where clause will have the correct range.
To do the rounding you will need to convert the times to datetime which you can do like so:
CAST(CONVERT(varchar,THE_TIME_AS_VARCHAR,121) AS datetime)
Then you can round down to the nearest 30 minutes like so:
DATEADD(mi, DATEDIFF(mi, 0, THE_TIME_AS_DATETIME)/30*30, 0)
And round up like so:
DATEADD(mi, DATEDIFF(mi, 30, THE_TIME_AS_DATETIME)/30*30, 0)
Applying all that to your existing code would give you this:
select t.time,
isnull(
(select c.studentCode
from tbclassrsv c
where c.transdate='2014-02-05 00:00:00'
and c.class='ROOM 01'
and c.status<>'DEL'
and t.time>= DATEADD(mi, DATEDIFF(mi, 0, CAST(CONVERT(varchar,c.time,121) AS datetime))/30*30, 0)
and t.time<= DATEADD(mi, DATEDIFF(mi, 30, CAST(CONVERT(varchar,c.until,121) AS datetime))/30*30, 0)
),'-') [Student]