Oracle的to_date日期函数与系统日期

oracle计算一年前的今天的日期

create or replace view v_rgq_one as
select "CODE","NAME","CUR_TIME","CUR_AMOUNT","VARIATION","LAST_TIME","LAST_AMOUNT" from (
select 
       cur_year.sj  as cur_time,
       cur_year.yql as cur_amount,
       cur_year.yql-last_year.yql as variation,
       last_year.sj    as last_time,
       last_year.yql  as last_amount
  from SMCOUNT cur_year left join sm_count last_year
  on cur_year.sj =
       to_char(add_months(to_date(last_year.sj, 'YYYY-MM-DD'), +12),
               'YYYY-MM-DD')
 order by cur_year.sj desc);

查看某张表一小时前的数据

select * from ct_user as of timestamp sysdate-(1/(24));