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,‘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‘),‘IW‘)--分组
order by to_char(t.start_time,‘IW‘) --排序

按月度查询

select to_char(t.start_time,‘YYYY-MM‘),‘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,‘Q‘),‘YYYY‘),‘Q‘)--分组
order byto_char(t.start_time,‘Q‘)--排序

按年度查询

select to_char(t.start_time,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