oracle 查询按月份分组

如下表table1：

日期(exportDate)               数量(amount)

--------------                    -----------

14-2月 -08                       20

10-3月 -08                       2

14-4月 -08                       6

14-6月 -08                       75

24-10月-09                      23

14-11月-09                      45

04-8月 -10                       5

04-9月 -10                       44

04-10月-10                      88

2.按月份分组

select to_char(exportDate,'yyyy-mm'),sum(amount) from table1 group by to_char(exportDate,'yyyy-mm')

order by to_char(exportDate,'yyyy-mm');

月份           数量

-----------------------------

2008-02    20

2008-03    2

2008-04    6

2008-06    75

2009-10    23

2009-11    45

2010-08    5

2010-09    44

2010-10    88

-------------------------------------------------------

1.按年份分组

select to_char(exportDate,'yyyy'),sum(amount) from table1 group by to_char(exportDate,'yyyy');

年份      数量

-----------------------------

2009    68

2010    137

2008    103

-------------------------------------------

3.按季度分组

select to_char(exportDate,'yyyy-Q'),sum(amount) from table1 group by to_char(exportDate,'yyyy-Q')

order by to_char(exportDate,'yyyy-Q');

季度          数量

------------------------------

2008-1    22

2008-2    81

2009-4    68

2010-3    49

2010-4    88

4.按周分组

select to_char(exportDate,'yyyy-IW'),sum(amount) from table1 group by to_char(exportDate,'yyyy-IW')

order by to_char(exportDate,'yyyy-IW');

周             数量

------------------------------

2008-07    20

2008-11    2

2008-16    6

2008-24    75

2009-43    23

2009-46    45

2010-31    5

2010-35    44

2010-40    88

补充：

按季度分组还有个比较笨的方法(参考网络资源)

select  to_char(exportDate,'yyyy'),

sum(decode(to_char(exportDate,'mm'),'01',amount,'02',amount,'03',amount,0)) as 第一季,

sum(decode(to_char(exportDate,'mm'),'04',amount,'05',amount,'06',amount,0)) as 第二季,

sum(decode(to_char(exportDate,'mm'),'07',amount,'08',amount,'09',amount,0)) as 第三季,

sum(decode(to_char(exportDate,'mm'),'10',amount,'11',amount,'12',amount,0)) as 第四季

from table1

group by to_char(exportDate,'yyyy');

年份        第一季     第二季     第三季     第四季

--------------------------------------------------

2009         0            0            0          68

2010         0            0            49        88

2008         22          81          0          0

转自 http://www.233.com/oracle/zonghe/20101026/114104335.html