Introduction to Data Types
Explore the role of data types in PostgreSQL relations, understanding how tuples and attributes form a data structure. This lesson helps you grasp data domains and types, enabling you to use PostgreSQL data types effectively to enhance correctness and performance in your applications.
We'll cover the following...
We'll cover the following...
In a relational database, we deal with relations. The main property of a relation is that all the tuples that belong to a relation share a common data definition: they have the same list of attributes, and each attribute is of a specific data type. Then we might also have some more constraints.
Definition of relations in databases
“In relational database theory, a relation, as originally defined by E. F. Codd, is a set of tuples ( ...