For each hour, list the number of called, total transactions' values, and total duration.

For each hour, list the number of called, total transactions' values, and total duration?

if you have these tables:

1- 'calls'
columns: called_number, Customer_ID, call_date, call_time_started, Call_time_ended,
transaction_no.

2- 'tariff'
columns: Tarriff_per_Sec, country_code, time_started, time_ended.