Define the following terms:
a. Entity
b. Entity Set
c. Attribute
d. Tuple
e. Domain
f. Key
g. Null
a. Entity – A person, place, item, event or a ‘thing’.
b. Entity Set – A collection of related entities. For example, entity
INVOICE contains information about invoices.
c. Attribute – A characteristic that describes an entity. For example, invoice
number and invoice date are attributes of entity INVOICE.
d. Tuple – Another name for a row or a record. It contains attributes of an
entity.
e. Domain – A set of all possible values for an attribute.
f. Key – A minimal set of attributes, which uniquely defines an entity in an
entity set.
g. Null – Unknown, unspecified, not known or not applicable value.
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