Question

A class in a relational database model is defined as:?

1) characteristics or properties of a table
2) person, place, thing, transaction, or event about which information is stored
3) the sum of a whole
4) being or existence, especially when considered as distinct, independent, or self-contained

Answer 1

In a relational database model, a class is defined as a structure representing persons, places, things, transactions, or events about which data is stored, similar to a noun in English.

Step-by-step explanation:

In the context of a relational database model, a class is commonly understood as a blueprint for creating tables or relations which represent a collection of entities. These entities are best defined by option 2: person, place, thing, transaction, or event about which information is stored. This definition aligns closely with the concept of a noun in English language, which also can represent a person, place, thing, or event.

The properties or attributes of these entities are represented as columns in a table, and each entry or row in the table represents an instance of the entity. For example, in a database for a school, a class could be 'Students', and its instances would include all the individiual students with attributes such as student ID, name, grade level, etc.