QUESTION $3$

A potential customer has described the following scenario to you:

We need to keep track of the data that our manufacturing firm needs to run smoothly.

We make a number of products, each of which is manufactured by a different de$-$

partment. Products are made up of a number of parts. Parts are bought from

suppliers.

You have been asked to perform a preliminary analysis of the scenario:

a$)$ Identify four sets of values from the scenario.

b$)$ Identify three relations from the scenario.

c$)$ Draw an entity$-$relationship diagram to visualise the sets and relations you have identi$-$

fied.

d$)$ Use the relations you identified in part b$)$ to define the following:

i$)$ A relation that records the parts that a department needs.

ii$)$ A relation that records the suppliers that a department deals with.