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sql-table-relations-introduction's Introduction

Introduction to Table Relations with SQL

Knowing at least the basics of writing SQL is a useful programming skill. The majority of databases you'll work with as a developer will have more than one table, and those tables will be connected together in various ways to form table relationships.

In this section we'll cover:

  • The structure of a relational database as tables
  • Primary key and foreign keys
  • How to associate data tables using a foreign key column
  • How to model a "many-to-many" object association
  • How a join table is used
  • Distinguishing the different types of relationships between data in a database
  • Different types of joins

Over the next several lessons we'll discuss having multiple tables in a database, how to define relationships between different tables, and explain the different types of table relationships that can exist.

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