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')