Compare minutes in query!

Question

Dear All,
I have 2 tables and fields store date and time.
I have to compare minutes:
Like in table 1 I have data
12:01
12:02
12:03
12:04
12:05
12:06
12:07
12:08
In table 2 i have data
12:01
12:03
12:07
I need a query whole result should be
12:01 12:01
12:02 0
12:03 12:03
12:04 0
12:05 0
12:06 0
12:07 12:07
12:08 0
This is the query i am trying but it shows only compared records.
select to_char(day_time,'hh24:mi') , nvl(to_char(monitor_date,'hh24:mi'),0)
from bssdata.att_time
left join
bssdata.com_query_monitor
on (to_char(day_time,'hh24:mi') = to_char(monitor_date,'hh24:mi'))
where trunc(monitor_date) = '19-JUL-2010'
and branch_id = 100
order by day_time
with this query i am getting thi as per above example:
12:01 12:01
12:03 12:03
12:07 12:07
Please help in writing this query.
Regards, Imran

Answer 1

Thanks for the help and support. You guys are right, it should work.
But maybe the problem is somewhere else.
I think I must go into details now.
I have 2 tables, structure are as following:
SQL> desc att_time
day_time date
SQL> desc com_query_monitor
monitor_date date
branch_id number(4)
duration *number(8)
user_id number(38)
Basically field day_time in table att_time contains all the minutes in one day that is date is fixed but time changes after every minute. It contains 1440 records Data in this table is like this:
01/05/2010 00:00:00
01/05/2010 00:01:00
01/05/2010 00:02:00
01/05/2010 00:03:00
01/05/2010 00:04:00
01/05/2010 00:05:00
01/05/2010 00:06:00
01/05/2010 00:07:00
01/05/2010 00:08:00
01/05/2010 00:09:00
Field monitor_date in table com_query_monitor contains data after every few minutes like 4 minutes or 5 minutes, data in this table is like this:
20/07/2010 00:00:01 100 2278 14210
20/07/2010 00:00:05 100 2279 14210
20/07/2010 00:00:07 100 2282 14210
Now when I want to see result from the table com_query_monitor for every minute, and should display zero where no comparison, I tried the following query:
select to_char(day_time,'dd/mm/yyyy hh24:mi:ss'),
to_char(day_time,'hh24:mi') format_day_time,
to_char(monitor_date,'dd/mm/yyyy hh24:mi:ss'),
nvl(to_char(monitor_date,'hh24:mi'),0) format_monitor_date
from att_time
left outer join
com_query_monitor
on (to_char(day_time,'hh24:mi') = to_char(monitor_date,'hh24:mi'))
where to_char(monitor_date,'dd/mm/yy') = '19/07/10'
and branch_id = 100
order by day_time
It is just showing the matching records (matching minutes) but not the minutes that exists in table att_time.
I hope this clears the situation
Regards, Imran Baig