oracle 按每天,每周,每月,每季度,每年查詢統計數據

//按天統計

select count(dataid) as 每天操作數量, sum()

from tablename

group by trunc(createtime, 'DD'))

//按自然周統計
select to_char(date,'iw'),sum()
from? tablename
group by to_char(date,'iw')

//按自然月統計
select to_char(date,'mm'),sum()
from?? tablename
group by to_char(date,'mm')

//按季統計
select to_char(date,'q'),sum()
from? tablename
group by to_char(date,'q')

//按年統計
select to_char(date,'yyyy'),sum()
from? tablename
group by to_char(date,'yyyy')