Course overview

In this course, you’ll learn how to write database descriptions. You’ll discover how to manage meta information about databases and tables by using PostgreSQL Internals. You’ll also learn how to debug your PostgreSQL queries using the EXPLAIN clause.

You’ll learn how to measure estimated and actual execution times of your queries and determine which SQL clause is the most computationally expensive to perform, as well as the biggest cause for long-running queries. You’ll learn concepts such as indexing and how it can greatly reduce querying speed.

You’ll also learn what it means to vacuum a PostgreSQL database, how it reduces query speeds, and how to vacuum a database, as well as what ACID means for database transactions and why it’s important for transaction blocks.

Best of all, you’ll learn by doing — you’ll practice and get feedback directly in the browser.

Key skills

    • Applying the fundamentals of PostgreSQL’'s internal tooling
    • Debugging PostgreSQL queries and finding bottlenecks
    • Using indices to optimize PostgreSQL queries

Course outline

    Loading lessons...

Projects in this course

The Dataquest guarantee

  • Dataquest has helped thousands of people start new careers in data. If you put in the work and follow our course, you'll master data skills and grow your career.

  • We believe so strongly in our courses that we offer a full satisfaction guarantee. If you complete a career course on Dataquest and aren't satisfied with your outcome, we'll give you a refund.

Master skills faster
with Dataquest

Go from zero to job-ready

Learn exactly what you need to achieve your goal. Don’t waste time on unrelated lessons.

Build your project portfolio

Build confidence with our in-depth projects, and show off your data skills.

Challenge yourself with exercises

Work with real data from day one with interactive lessons and hands-on exercises.

Showcase your course certification

Impress employers by completing a capstone project and certifying it with an expert review.

Learning resources

How to Learn
Data Science

Learn a proven method to acquire and use data skills.

Read Article

Dataquest Reviews

Read more about what learners think of Dataquest.

Read Article

How To Learn Python

A step by step guide to learn and master Python.

Read Article

Python Practice

65 different Python practice exercises you can start today.

Read Article

Learner testimonials


Learners who recommend
Dataquest for career advancement


Dataquest rating on
G2Crowd and SwitchUp


Average salary boost
for learners who complete a path

Join 1M+ data learners on

  • 1

    Sign up for a free account

  • 2

    Choose a course or path

  • 3

    Learn with hands-on exercises

  • 4

    Apply your skills

Start learning with a free account today.

Sign Up For Dataquest