日期和间隔：

botang

1. select sysdate+1 from dual;
   
2. 
   
3. select  sysdate +1/24  from dual;
   
4. 
   
5. select  add_months(sysdate,2) from dual;
   
6. 
   
7. select  sysdate +  interval '10-2' year to month   from dual;
   
8. 
   
9. select  sysdate +  interval '100-2' year(3) to month   from dual;

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