What is the difference between MySQL and SQLite?

MySQL is a server-based relational database system, while SQLite is a lightweight database stored in a local file without a separate server.

Why should I use a WHERE clause in MySQL UPDATE or DELETE statements?

A WHERE clause limits the affected rows and helps prevent accidentally updating or deleting every record in a table.

What does DISTINCT do in a MySQL SELECT query?

DISTINCT removes duplicate rows from query results, returning only unique values or value combinations.

Free online course MySQL

Duration of the online course: 1 hours and 11 minutes

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Build job-ready SQL skills with a free MySQL course: query data fast, write safer updates, and master joins, DISTINCT, and keys to earn a certificate.

In this free course, learn about

What MySQL is and where it fits among relational database systems
How primary keys uniquely identify rows and enforce entity integrity
Using MySQL Workbench to manage databases and execute queries
SQL query syntax conventions (keywords, clauses order, formatting best practices)
Running queries efficiently in Workbench using the correct keyboard shortcut
Why WHERE clauses are critical to safely UPDATE/DELETE only intended rows
Using DISTINCT to remove duplicate values from query results
Choosing and recognizing column data types (e.g., the posts.body column type)
Selecting the right JOIN to return only posts that have matching comments
What SQLite is and how it differs from server-based databases like MySQL

About the free online course

MySQL is one of the most widely used relational databases in the world, and knowing how to work with it can immediately upgrade how you handle data at work or in your personal projects. This free online course guides you from the first contact with SQL to the practical mindset needed to query, refine, and relate information with confidence. Whether your goal is to break into tech, strengthen your programming toolkit, or improve reporting and analytics, you will learn to think in tables, relationships, and precise questions that data can answer.

You will start by understanding what MySQL is and why relational databases remain essential for reliable applications. From there, you will build solid foundations around primary keys and how they protect data integrity and make relationships possible. You will also work with a recommended management tool so your practice feels close to real-world workflows, including productivity details like running queries efficiently and following clear syntax conventions that make your SQL easier to read, debug, and share.

As you progress, you will focus on the habits that separate casual query writing from professional database work. You will learn why a WHERE clause is critical when updating or deleting records, reducing the risk of costly mistakes. You will practice extracting cleaner results with DISTINCT, choose appropriate data types for realistic content such as post bodies, and understand how joins shape the story your data tells. By the end, you will be more comfortable moving between related tables, selecting only what matters, and writing queries that match practical requirements like returning only posts that have comments.

This course also helps you navigate the broader database landscape by clarifying how MySQL compares with lighter options like SQLite, making it easier to choose the right tool for each scenario. If you are looking for a structured, beginner-friendly way to gain usable database skills, this course is a direct step toward building, querying, and maintaining data-driven applications with MySQL.

Course content

Video class: MySQL Crash Course | Learn SQL 1h11m
Exercise: _What is MySQL?
Exercise: _What is a primary key in a relational database?
Exercise: _What is the recommended tool to manage MySQL databases?
Exercise: _What is the correct syntax convention for SQL queries?
Exercise: _What is the keyboard shortcut to run a query in MySQL Workbench?
Exercise: _What is the importance of adding a WHERE clause when updating or deleting data in MySQL?
Exercise: _What is the purpose of using the DISTINCT keyword in MySQL?
Exercise: _What is the data type used for the "body" column in the "posts" table?
Exercise: _What type of join would you use if you want to get all posts that have a comment, but not posts without comments?
Exercise: _What is SQL Lite?