oracle数据库按月、年查询统计数据的方法

这里提供了一种方法，挺不错oracle 实现按周,月,季度,年查询统计数据 。

还在网上看到用trunc来搞也可以，下面是个例子，两句SQL效果一样的.
id有重复的，所以group by搞了两个字段.
只在Oracle数据库里试过，其它库没试过。

view source print ?

1	create table CONSUMER_ACC

2

(

3	ID VARCHAR2(50) not null ,

4	ACC_NUM VARCHAR2(10),

5	DATETIME DATE

6

)

view source print ?

01	select t.id,trunc(t.datetime, 'mm' ) as d, sum (t.acc_num) as n

02	from CONSUMER_ACC t

03

--where

04	group by t.id,trunc(t.datetime, 'mm' )

05	order by n desc ;

06

07	select t.id,to_char(t.datetime, 'mm' ) d , sum (t.acc_num) n

08	from CONSUMER_ACC t

09

--where

10	group by t.id,to_char(t.datetime, 'mm' )

11	order by n desc ;

下面是上文的引用：

//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’)

貌似还有一种sum over的办法可以用：link