oracle 时间

Posted 未来的羁绊

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了oracle 时间相关的知识,希望对你有一定的参考价值。

select to_char(to_date(sysdate,yyyy-mm-dd),day) from dual;

select to_date(2017-12-31,day) from dual;

select sysdate,to_char(sysdate,yyyy-mm-dd hh24:mi:ss) from dual;   
select sysdate,to_char(sysdate,yyyy-mm-dd hh:mi:ss) from dual;   
select sysdate,to_char(sysdate,yyyy-ddd hh:mi:ss) from dual;   
select sysdate,to_char(sysdate,yyyy-mm iw-d hh:mi:ss) from dual;   
    

select TO_CHAR(SYSDATE,YYYYMMDD) res from dual;

select TRUNC(LAST_DAY(SYSDATE))+1 res from dual;


select TO_CHAR(TRUNC(sysdate) + 3,YYYYMMDD) res from dual;

select to_date(1996,yyyy) - to_date(1995,yyyy)  from dual;
select to_date(1995,yyyy) - to_date(1994,yyyy)  from dual;  
select to_date(2008,yyyy) - to_date(2007,yyyy)  from dual;
select to_date(2000,yyyy) - to_date(1999,yyyy)  from dual;
select to_date(2004,yyyy) - to_date(2003,yyyy)  from dual;
select to_date(2020,yyyy) - to_date(2019,yyyy)  from dual;
select to_date(sysdate,yyyy) - to_date(sysdate,yyyy) -1  from dual;

select ADD_MONTHS(trunc(sysdate,yyyy),12) from dual;

select to_date(to_char(ADD_MONTHS(trunc(sysdate,yyyy),12)),RRRR) from dual;

select TO_CHAR(SYSDATE,RRRR) + 1 from dual;

select to_date(TO_CHAR(SYSDATE,RRRR),yyyy) - to_date(TO_CHAR(SYSDATE,RRRR)-1,yyyy)  from dual;

select * from ADD_MONTHS(trunc(sysdate,yyyy),12)+2/24 from dual;

select TO_CHAR(2017-12-29,DAY) from dual;

--当前的年月日20171231
select TO_CHAR(TRUNC(sysdate) + 3,YYYYMMDD) res from dual;

select TO_CHAR(TRUNC(sysdate) + 3,DS) res from dual;

select to_char(to_date(TRUNC(sysdate),yyyy-mm-dd),d) from dual;

select to_char(to_date(TRUNC(sysdate),yyyy-mm-dd),IW) from dual;

 

以上是关于oracle 时间的主要内容,如果未能解决你的问题,请参考以下文章