Oracle函数：访问当天时间，访问前几天的时间select sysdate-1 from dual?select sysdate+/-n from dual??
Oracle函数：访问当天时间，访问前几天的时间
select sysdate-1 from dual?
select sysdate+/-n from dual?
?
Oracle函数：访问当天时间，访问前几天的时间
select sysdate-1 from dual?
select sysdate+/-n from dual?
?