oracle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