SQL Primary Key and Unique Constraint in MySQL | SQL Constraints Tutorial Part 10

SQL Primary Key and Unique Constraint in MySQL | SQL Constraints Tutorial Part 10

Learn SQL Primary Key and Unique Constraint in MySQL with practical examples in this beginner-friendly SQL tutorial. In this video, you will understand how Primary Key works, why it is important in database design, how it prevents duplicate and NULL values, and how Unique Constraint ensures data uniqueness across columns.

This SQL tutorial is part of the complete SQL for Beginners course where we explain database concepts with real-world examples and hands-on MySQL queries. You will also learn how to create tables with Primary Key and Unique constraints, insert records, handle duplicate entry errors, and display all tables available in a database using SQL commands.

Topics Covered:
• What is Primary Key in SQL
• Rules of Primary Key
• NULL and Duplicate Restrictions
• Creating Primary Key in MySQL
• Insert Data into Tables
• Handling Duplicate Entry Errors
• What is Unique Constraint
• Difference Between Primary Key and Unique Constraint
• Applying Unique Constraint on Multiple Columns
• Practical MySQL Examples
• SHOW TABLES Command in SQL
• Interview Questions on Primary Key and Unique Constraint

This video is perfect for:
SQL Beginners
Database Students
MySQL Learners
College Students
Interview Preparation
Backend Developers
Data Analysts
Software Engineers

Watch the complete SQL playlist to master SQL from beginner to advanced level with practical projects and real-world database examples.

Timestamp:

00:00 Introduction
00:17 What is Primary Key?
01:15 Primary Key Rules
02:25 Primary Key Syntax
02:47 Create Table with Primary Key
04:46 Insert Data
05:25 SELECT Query
05:47 Duplicate Primary Key Error
07:03 NULL Value Error
07:31 What is Unique Constraint?
08:25 Create Table with Unique Constraint
09:19 Why Use Unique Constraint?
10:28 Department Table Example
11:10 Insert Records
12:57 Multiple Record Insertion
13:05 Duplicate Primary Key Example
13:43 Duplicate Unique Constraint Example
14:16 Duplicate Email Error
14:46 Unique Constraint Demo
15:26 View Table Data
15:34 SHOW TABLES Command
16:20 SQL Interview Tip
17:05 Summary
17:15 Next Topic: Foreign Key

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