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SQL Constraints

Introduction
1. Welcome
Primary keys
Foreign keys
Updating and deleting with foreign keys
Summary

Instruction

Hello and welcome to Working With Constraints, the third course in the Creating Database Structure track.

In this course, you're going to learn a concept which will make it easier to work with data models: constraints.

Constraints are special rules for table data. They tell the database what values are allowed in specific columns – e.g., each salary should be greater than 0, each person should have a name stored in the database, etc. If there is a value which violates the rules, the row won't be added. Constraints are used to keep database data correct.

Let's get started!

Exercise

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