(转)postgreSQL 实现按月按年，按日统计 分组统计
--按年分组查看

select to_char(to_timestamp(start_time_of_date::bigint), 'YYYY') as d , count(cdr_id) as total_call,sum (call_duration::integer /60 +1) as total_duration from cdr
where to_timestamp(start_time_of_date::bigint) between '2010-01-01' and '2010-12-12' group by d


--按月分组查看
select to_char(to_timestamp(start_time_of_date::bigint), 'YYYY-MM') as d , count(cdr_id) as total_call,sum (call_duration::integer /60 +1) as total_duration from cdr
where to_timestamp(start_time_of_date::bigint) between '2010-01-01' and '2010-12-12' group by d

--按天分组查看
select to_char(to_timestamp(start_time_of_date::bigint), 'YYYY-MM-DD') as d , count(cdr_id) as total_call,sum (call_duration::integer /60 +1) as total_duration from cdr
where to_timestamp(start_time_of_date::bigint) between '2010-01-01' and '2010-12-12' group by


--按小时分组查看
select to_char(to_timestamp(start_time_of_date::bigint), 'YYYY-MM-DD HH24 ' ) as d , count(cdr_id) as total_call,sum (call_duration::integer /60 +1) as total_duration from cdr
where to_timestamp(start_time_of_date::bigint) between '2010-01-01' and '2010-12-12' group by d order by d


--按秒分组查看
select to_char(to_timestamp(start_time_of_date::bigint), 'YYYY-MM-DD HH24:MI:SS ' ) as d , count(cdr_id) as total_call,sum (call_duration::integer /60 +1) as total_duration from cdr
where to_timestamp(start_time_of_date::bigint) between '2010-01-01' and '2010-12-12' group by d