A relation is a table with rows and columns from "summary" of SQL and Relational Theory by C. Date
Let's start by considering the concept of a relation. A relation is a fundamental concept in the theory of relational databases. It's essentially a table that consists of rows and columns. Each row represents a tuple or record, while each column represents an attribute or field. This tabular format makes it easy to organize and store data in a structured manner. The rows in a relation are unique, meaning each row contains distinct values for the attributes defined by the columns. This uniqueness is enforced by the primary key, which is a special column (or set of columns) that uniquely identifies each row in the relation. Without a primary key, it would be difficult to ensure the integrity and consisten...
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