2. A relation is a collection of inter related data. Relations are also called tables. A database is a set of relations. It may contain 1 or more than 1 relation.
==> A group of relation together is called database

4. a. Here the subtraction and then product takes place
as 8*10
We get 80 displayed one single time

b. Here (12-4) * 10 is calculated once. The product is displayed n times, where n is the total no of rows of the table called empl.
Eda ente kaiyil empl table illla. Aa worksheet il und. Aa rows enthoram und enn nokitt The product of the nos will be displayed athreyum times enn ezhuthiyal mathi
Enitt Output:
80
80
80
80
ingane koduthal mati