Transaction count for a Date and Hour

Question

Hi,
We have a audit table called ALL_RT_AUDIT_MAP_RUNS which keeps number of transactions by jobs. We would like to find out, for a date, which Hour is having the maximum number of transactions.
We have written the following query but it does not give 'which hour'? please help
select Date_d,MAX(Tx_Cnt)
from
select trunc(end_time) Date_d,SUBSTR(TO_CHAR(end_time,'YYYY MM HH24 MI SS'),9,2)hr, sum(NUMBER_RECORDS_INSERTED) + sum(NUMBER_RECORDS_UPDATED) + sum(NUMBER_RECORDS_DELETED)+sum(NUMBER_RECORDS_MERGED) Tx_Cnt
from ALL_RT_AUDIT_MAP_RUNS
group by SUBSTR(TO_CHAR(end_time,'YYYY MM HH24 MI SS'),9,2),trunc(end_time)
order by 1 desc
group by Date_d
Regards, Anirban

Answer 1

What about something like this:
select Date_d,MAX(Tx_Cnt)
from
select to_char(end_time,'YYYY MM DD HH24:MI') Date_d, sum(NUMBER_RECORDS_INSERTED) + sum(NUMBER_RECORDS_UPDATED) + sum(NUMBER_RECORDS_DELETED)+sum(NUMBER_RECORDS_MERGED) Tx_Cnt
from ALL_RT_AUDIT_MAP_RUNS
group by to_char(end_time,'YYYY MM DD HH24:MI')
order by 1 desc
group by Date_dBye,
Antonio