SQL*Plus uses column names as default column headings while displaying query results. You can customize your own column heading and width with the help of following commands.
To assign a new column heading, use the following command syntax:
heading ;e.g. column ename heading EmpName;
To set the width of column to four characters, use the following command:
Use format a5; to set the width to five characters, format a3; to set the width of the column to three characters and so on.