Question

Define the following:
a. Relation
b. Entity
c. Field​

Answer 1

a) Relation : A relation between two sets is a collection of ordered pairs containing one object from each set. If the object x is from the first set and the object y is from the second set, then the objects are said to be related if the ordered pair (x,y) is in the relation. A function is a type of relation.

b) Entity : Being existence especially independent, separate, or self-contained existence.

c) Field : A field is an area in a fixed or known location in a unit of data such as a record, message header, or computer instruction that has a purpose and usually a fixed size. In some contexts, a field can be subdivided into smaller fields.

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