Lectures

A detailed step-by-step guide on how to create the students and courses tables in a database, and how to set up relationships between them using foreign keys. We'll break down SQL commands, table structure, and give you query examples to help you lock in the material.

In this lecture, you'll learn how to set up a MANY-TO-MANY relationship between students and courses using an intermediate table called enrollments in PostgreSQL. We'll break down the table structures, check out some SQL query examples, insert data, and look at common mistakes when working with foreign keys.

Learn how foreign keys in PostgreSQL keep your data consistent, stop mismatched records from popping up, and help you maintain the logic between your tables. We’ll look at examples, common mistakes, and how to handle them.

Learn how to properly delete and update data in relational databases when foreign keys are involved. We'll break down ON DELETE and ON UPDATE options, check out some cascade operation examples, and look at common mistakes when working with integrity constraints.

Check out the most common mistakes when working with foreign keys in PostgreSQL and other DBMS: from missing indexes to breaking data integrity. Learn how to avoid them and make your database reliable and fast.