Question

Explain what cardinality ratios specify.

a.The relationship between tables in a database.
b.The type of data used in a data model.
c.The number of instances of one entity that can be associated with the number of instances in another entity.
d.The data types used for cardinality. Discuss what data model means and list the types of data model used in a database.
a. A data model represents a database's architecture and structure. Types include hierarchical, network, relational, and object-oriented.
b.A data model is a graphical representation of data. Types include bar charts, pie charts, and line graphs.
c.A data model is a database's user interface. Types include forms, reports, and queries.
d.A data model is the physical implementation of a database. Types include primary keys, foreign keys, and indexes.

Answer 1

Cardinality ratios specify the relationship between tables in a database and the number of instances that can be associated with each other.

Step-by-step explanation:

a. The relationship between tables in a database. Cardinality ratios specify the number of instances of one entity that can be associated with the number of instances in another entity. For example, a cardinality ratio of 1:1 means that each instance in one entity can be associated with only one instance in another entity. On the other hand, a cardinality ratio of 1:N means that each instance in one entity can be associated with multiple instances in another entity.

d. The data types used for cardinality. Cardinality itself does not have specific data types. It is a concept used to describe the relationship between different instances in a database.