oracle 实现按天,周,月,季度,年查询统计数据

//按天统计
select count(dataid) as 每天操作数量, sum()
from
where
group by trunc(createtime, 'DD'))
//按自然周统计
select to_char(date,'iw'),sum()
from
where
group by to_char(date,'iw')
//按自然月统计
select to_char(date,'mm'),sum()
from
where
group by to_char(date,'mm')
//按季统计
select to_char(date,'q'),sum()
from
where
group by to_char(date,'q')
//按年统计
select to_char(date,'yyyy'),sum()
from
where
group by to_char(date,'yyyy')