MySQL

Summary

One of the most widely deployed open-source relational databases, historically popular with the LAMP stack and still extremely common in production systems.

How to Learn This

1Install MySQL locally and run the same queries you practiced in PostgreSQL.
2Compare MySQL and PostgreSQL's syntax differences for a few common operations.
3Learn storage engines (InnoDB) and why they matter for transactions.

PostgreSQL

Constraints & Keys

More topics in SQL Databases

Relational Database Concepts SQL Basics (SELECT, INSERT, UPDATE, DELETE)Joins Indexes Normalization Transactions ACID Properties PostgreSQL Constraints & Keys Views Stored Procedures Database Design & ER Diagrams Migrations

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