資料庫的日期操作

between

to_date(to_char(sysdate,'yyyy-mm-dd') || ' 00:00:01','yyyy-mm-dd hh24:mi:ss')

andto_date(to_char(sysdate,'yyyy-mm-dd') || ' 23:59:59','yyyy-mm-dd hh24:mi:ss');

oracle

字段型別為varchar2，格式要與格式化的樣式匹配

當天select * from 表名 where to_char(to_date(欄位名,'yyyy-mm-dd hh24:mi:ss'),'dd')=to_char(sysdate,'dd')

當周select * from 表名 where to_char(to_date(欄位名,'yyyy-mm-dd hh24:mi:ss'),'iw')=to_char(sysdate,'iw')

當月select * from 表名 where to_char(to_date(欄位名,'yyyy-mm-dd hh24:mi:ss'),'mm')=to_char(sysdate,'mm')

當季度select * from 表名 where to_char(to_date(欄位名,'yyyy-mm-dd hh24:mi:ss'),'q')=to_char(sysdate,'q')

字段型別為date

當天select * from 表名 where to_char(欄位名,'dd')=to_char(sysdate,'dd')

當周select * from 表名 where to_char(欄位名,'iw')=to_char(sysdate,'iw')

當月select * from 表名 where to_char(欄位名,'mm')=to_char(sysdate,'mm')

當季度select * from 表名 where to_char(欄位名,'q')=to_char(sysdate,'q')

sql當天

select * from 表名 where datepart(dd,欄位名) = datepart(dd, getdate()) and datepart(mm, 欄位名) = datepart(mm, getdate()) and

datepart(yy, 欄位名) = datepart(yy, getdate())

當周select * from 表名 where datepart(wk, 欄位名) = datepart(wk, getdate()) and datepart(yy, 欄位名) = datepart(yy, getdate())

當月select * from 表名 where datepart(mm, 欄位名) = datepart(mm, getdate()) and datepart(yy, 欄位名) = datepart(yy, getdate())

當季度select * from 表名 where datepart(qq, 欄位名) = datepart(qq, getdate()) and datepart(yy,欄位名) = datepart(yy, getdate())