The following Figure 1 shows some portion of the database of a company on medical claims. Refer to the relations, Claim and ClaimType shown in the diagram and answer the following questions.
a)
How many tuples are there in the ClaimType relation? [2 Marks]
b)
What is the degree of the ClaimType relation? [2 Marks]
c)
The Superkey for the Claim relation is provided as follows:
claimNo,
{claimNo, dateFrom},
{claimNo, empID},
{dateFrom, empID, claimCode}
Define the term Superkey [4 Marks]
d)
From the superkey listed above in (c), determine which is candidate key and which is not. [4 Marks]
e)
From the candidate key listed in (d), determine the primary key and the alternate key. [4 Marks]
f)
List the foreign keys. [4 Marks]
#Define #term #Superkey
