Flat Files - Answer - a file having no internal hierarchy

Hashed Files - Answer - A file that has been encrypted for security purposes.

Heap File - Answer - An unsorted set of records.

Information - Answer - The transformation of raw data into useful facts.

Punch Card - Answer - A card that is perforated and can hold commands or data.

Structured Data - Answer - Information with a high degree of organization.

Unstructured Data - Answer - Information that does not have structure (such as text)

Binary Relationship - Answer - A relationship between two entity types.

Unary Relationship - Answer - An associate occurrence of an entity type with other occurrences of the same entity type.

Cardinality - Answer - The maximum number of entities that can be involved in a particular relationship.

E-R Model

*E-R = Entity - Relationship - Answer - Diagram of entities together with their attributes and the relationship among them.

Intersection Data - Answer - It is data that describes a many-to-many relationship.

Modality - Answer - It is a minimum number of entity occurrences that can be involved in a relationship.

One-to-one Binary Relationship - Answer - It means that a single occurrence of one entity type can be associated with a single occurrence of the other entity type and vice versa.

Ternary Relationship - Answer - Involves three different entity types.

Unique identifier - Answer - It is used to uniquely identify each record in a database table.

Attribute - Answer - A property, characteristic, or fact that we know about an entity.