oracle按天，周，月，季度，年查詢排序
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')
按天查詢
select to_char(t.start_time,'YYYY-MM-DD') day ,count(*) from test t
where to_char(t.start_time,'YYYY')='2019' --條件限制
group by to_char(t.start_time,'YYYY-MM-DD') --分組
order by to_char(t.start_time,'YYYY-MM-DD') --排序
按周查詢
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' --條件限制
group by to_char(t.start_time,'YYYY') year ,to_char(t.start_time,'IW')--分組
order by to_char(t.start_time,'YYYY') year,to_char(t.start_time,'IW') --排序
按月度查詢
select to_char(t.start_time,'YYYY-MM') ,count(*) from test t
where to_char(t.start_time,'YYYY')='2019' --條件限制
group by to_char(t.start_time,'YYYY-MM') --分組
order byto_char(t.start_time,'YYYY-MM') --排序
按季度查詢
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' --條件限制
group by to_char(t.start_time,'YYYY') ,to_char(t.start_time,'Q')--分組
order byto_char(t.start_time,'YYYY') ,to_char(t.start_time,'Q')--排序
按年度查詢
select to_char(t.start_time,'YYYY') year ,count(*) from test t
where to_char(t.start_time,'YYYY')='2019' --條件限制
group by to_char(t.start_time,'YYYY') --分組
order by to_char(t.start_time,'YYYY') --排序
知識點擴展：oracle 實現按天,周,月,季度,年查詢統計數據
這里提供了一種方法，挺不錯oracle 實現按周,月,季度,年查詢統計數據 。
還在網上看到用trunc來搞也可以，下面是個例子，兩句SQL效果一樣的.
id有重復的，所以group by搞了兩個字段.
只在Oracle數據庫里試過，其它庫沒試過。
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
------------------------------------------------------------------------------
//按天統計
select count(dataid) as 每天操作數量, sum()
from
where
group by trunc(createtime, 'DD'))
//按自然周統計
select to_char(date,'iw'),sum()
from
where
group by to_char(date,'iw')
//按自然月統計
select to_char(date,'mm'),sum()
from
where
group by to_char(date,'mm')
//按季統計
select to_char(date,'q'),sum()
from
where
group by to_char(date,'q')
//按年統計
select to_char(date,'yyyy'),sum()
from
where
group by to_char(date,'yyyy')
