If we want to give temporarily name to a table then we can do easily with " as " statement .
Sometime permanent name of table is very confusing so we need temporary name of table to make easy understanding .
Syntax

select old_col_name as new_col_name  from table_name ;

Example ->
Table name -> student

    **Student_name**     **Student_Age**          **Student_Id**
        Mukesh                    23                      1
        Ayush                     24                      2
        Ishan                     20                      4
        Pranav                    35                      7   
        Abhishek                  26                      8
        Ravi                      25                      3

If i want to change( temporary ) the name of the table Student_name , Student_Age ;

select Student_name as Name Student_Age as Age from student ;

outpute->

       **Name**                 **Age**         **Student_Id**
        Mukesh                    23                      1
        Ayush                     24                      2
        Ishan                     20                      4
        Pranav                    35                      7   
        Abhishek                  26                      8
        Ravi                      25                      3