oracle获取本周、本月、本季度、本年度的第一天和最后一天(中国的算法)
--本周
select trunc(sysdate,'d')+1 from dual; select trunc(sysdate,'d')+7 from dual;
?
--本月
?
select trunc(sysdate,'mm') from dual; select last_day(trunc(sysdate)) from dual;
?
?
select trunc(sysdate,'Q') from dual; select add_months(trunc(sysdate,'Q'),3)-1 from dual;
??
?
--本年
?
select trunc(sysdate,'yyyy') from dual; select add_months(trunc(sysdate,'yyyy'),12)-1 from dual;
?
