SQL开发知识：oracle数据库实现按天，周，月，季度，年查询排序方法
oracle按天，周，月，季度，年查询排序
天–to_char(t.start_time,’YYYY-MM-DD’)
周 –to_char(t.start_time,’YYYY’)，to_char(t.start_time,’IW’)
月度–to_char(t.start_time,’YYYY-MM’)
季度–to_char(t.start_time,’YYYY’)，to_char(t.start_time,’Q’)
年度–to_char(t.start_time,’YYYY’)
按天查询
select to_char(t.start_time,’YYYY-MM-DD’) day ,count(*) from test t
where to_char(t.start_time,’YYYY’)=’2019′ –条件限制
group by to_char(t.start_time,’YYYY-MM-DD’) –分组
order by to_char(t.start_time,’YYYY-MM-DD’) –排序
按周查询
select to_char(t.start_time,’YYYY’) year ,to_char(t.start_time,’IW’),count(*) from test t
where to_char(t.start_time,’YYYY’)=’2019′ –条件限制
group by to_char(t.start_time,’YYYY’) year ,to_char(t.start_time,’IW’)–分组
order by to_char(t.start_time,’YYYY’) year,to_char(t.start_time,’IW’) –排序
按月度查询
select to_char(t.start_time,’YYYY-MM’) ,count(*) from test t
where to_char(t.start_time,’YYYY’)=’2019′ –条件限制
group by to_char(t.start_time,’YYYY-MM’) –分组
order byto_char(t.start_time,’YYYY-MM’) –排序
按季度查询
select to_char(t.start_time,’YYYY’) year ,to_char(t.start_time,’Q’),count(*) from test t
where to_char(t.start_time,’YYYY’)=’2019′ –条件限制
group by to_char(t.start_time,’YYYY’) ,to_char(t.start_time,’Q’)–分组
order byto_char(t.start_time,’YYYY’) ,to_char(t.start_time,’Q’)–排序
按年度查询
select to_char(t.start_time,’YYYY’) year ,count(*) from test t
where to_char(t.start_time,’YYYY’)=’2019′ –条件限制
group by to_char(t.start_time,’YYYY’) –分组
order by to_char(t.start_time,’YYYY’) –排序
知识点扩展：oracle 实现按天,周,月,季度,年查询统计数据
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。
create table CONSUMER_ACC
(
ID VARCHAR2(50) not null ,
ACC_NUM VARCHAR2(10),
DATETIME DATE
)
select t.id,trunc(t.datetime, ‘mm’ ) as d, sum (t.acc_num) as n
from CONSUMER_ACC t
–where
group by t.id,trunc(t.datetime, ‘mm’ )
order by n desc ;
select t.id,to_char(t.datetime, ‘mm’ ) d , sum (t.acc_num) n
from CONSUMER_ACC t
–where
group by t.id,to_char(t.datetime, ‘mm’ )
order by n desc
——————————————————————————
//按天统计
select count(dataid) as 每天操作数量, sum()
from
where
group by trunc(createtime, ‘DD’))
//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’)
总结
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