Cast Function 
 
           Cast is to convert data type. 
For e.g: 
create table a as
Select CAST(hire_date AS CHAR(40))"H_DATE" FROM employees;
select * from a;
DATE_TIME_DISPLAY_FORMAT = "yyyy/mm/dd hh:mi:ss" ;
DATE_DISPLAY_FORMAT = "yyyy/mm/dd" ;
           TIME_DISPLAY_FORMAT = "hh:mi:ss" ;
 



