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  • oracle 时间

    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;
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  • 原文地址:https://www.cnblogs.com/520future/p/8175570.html
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