Intermediate Code District

MySQL

The web's most deployed open-source database.

MySQL is the open-source database behind WordPress, countless PHP and Laravel apps, and some of the largest sites on the web. You already speak SQL from the SQL track, so this course maps what you know onto MySQL 8.4 LTS and shows where it differs from PostgreSQL: the mysql client, data types, utf8mb4 for Persian text and emoji, InnoDB and its clustered primary key, EXPLAIN, transactions under REPEATABLE READ, upserts with ON DUPLICATE KEY UPDATE, least-privilege users and backups you can actually restore.

Every lesson is short and practical, and the result sets stay tiny, so you can check every answer by eye.

Lessons: 14
Time: 2 h
Level: Intermediate

Start the track · Meet MySQL

Bronze open
Silver open
Gold locked

Ready to prove it?

Three exams are waiting: Bronze, Silver and Gold.

Go to the exams

What you'll be able to do

Connect with the mysql client and find your way around databases and tables
Translate PostgreSQL habits into MySQL: AUTO_INCREMENT, booleans, DATETIME and TIMESTAMP
Store Persian text and emoji safely with utf8mb4
Read EXPLAIN and design indexes around InnoDB's clustered primary key
Use transactions and INSERT ... ON DUPLICATE KEY UPDATE correctly
Create least-privilege users and take backups you can restore

The journey

1
Module 1
MySQL for SQL people

Where MySQL runs, the mysql client, the data types that differ from PostgreSQL, and utf8mb4.

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2
Module 2
Running MySQL well

InnoDB and indexes, transactions, upserts, users and backups.

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3
Module 3
Next steps

Replication, slow queries, JSON columns and changing big tables without downtime.

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