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
