Help me in solving GSQ08 problem

help
,
1

My issue

alter table employee
add column Designation varchar (20);

My code

/* Write a query to add a column 'Designation' to the table and set 'Null' as the default value. Output the entire table.*/
alter table employee
add column Designation varchar (20);

Learning course: Learn SQL
Problem Link: CodeChef: Practical coding for everyone