//按天统计

select count(dataid) as 每天操作数量, sum()

from tablename

group by trunc(createtime, 'DD'))

//按自然周统计 
select to_char(date,'iw'),sum() 
from  tablename
group by to_char(date,'iw') 

//按自然月统计 
select to_char(date,'mm'),sum() 
from   tablename
group by to_char(date,'mm') 

//按季统计 
select to_char(date,'q'),sum() 
from  tablename
group by to_char(date,'q') 

//按年统计 
select to_char(date,'yyyy'),sum() 
from  tablename
group by to_char(date,'yyyy')