How to create these files

and where can i use this code on?

please show me with images so i can understand

more

1. q1a.sql -- This file lists all Category Names ordered alphabetically by descent SELECT CategoryName FROM Category ORDER BY CategoryName DESC; -- End of q1a.sql 2. q1b.sql -- This file lists all Product Names ordered alphabetically by descent SELECT ProductName FROM Product ORDER BY ProductName DESC; -- End of q1b.sql 3. q1c.sql -- This file lists all Employee Last Names ordered alphabetically by descent SELECT LastName FROM Employee ORDER BY LastName DESC; -- End of q1c.sql