Udemy

SQL Crash Course From Zero – Learn SQL with Postgres - 2026

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  • 393 Students
  • Updated 2/2026
4.5
(29 Ratings)
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Course Information

Registration period
Year-round Recruitment
Course Level
Study Mode
Duration
4 Hour(s) 20 Minute(s)
Language
English
Rating
4.5
(29 Ratings)

Course Overview

SQL Crash Course From Zero – Learn SQL with Postgres - 2026

Start from Zero: Become confident using SQL in any database - for Marketer, Business Analyst, Data Scientist, Researcher

Let me take you back to 2009:


Back then, I thought I had it all figured out. I had just finished my master's degree and thought, "Now I'm ready to work on any data project and be the best.

But then I joined my first project and walked into a meeting where I heard so many words that I had no idea what they meant. I began to feel insecure.

The month didn't get better. In fact, it got worse. By the time the on-boarding was over, I was sitting there with all these tools, terms, tasks, and I was really frustrated.

Fortunately, I met some great people along the way who had the willingness and talent to share their knowledge about things that just seemed weird to me. So I found help in simple words and precise examples. Finally, I began to understand.


Can you relate to my story? Maybe you are at this point now. Then I want this for you.

I would love to be one of those coaches on your journey to mastering data, SQL, and databases.

What can you expect to learn in this course?


  • We will start at zero, 0, null. Promised!

  • Use lots of examples and small steps to build your skills.

  • Sprinkle in a lot of exercises and repetition.


If you ever get stuck, don't hesitate to send me a message.

We can walk this path together.


I really look forward to seeing you in this course!

Course Content

  • 17 section(s)
  • 74 lecture(s)
  • Section 1 Course Overview and 10 Minutes of SQL
  • Section 2 Database Introduction - Basic Terminology and Course Setup
  • Section 3 Tables and Inserting Data - with CREATE & INSERT
  • Section 4 Query Data - with SELECT, WHERE, ORDER, LIMIT
  • Section 5 Data Types - Numeric, String, Date, Boolean
  • Section 6 Remove Data & Objects - DROP, TRUNCATE
  • Section 7 Modify Data and Objects - ALTER, UPDATE
  • Section 8 Constraints - for good data & structure
  • Section 9 Normalization - How to structure a database
  • Section 10 Operators - for Arithmetic, Comparison, Logic
  • Section 11 Functions – Built-in Code for Strings, Numbers, Conversion, Dates and more
  • Section 12 Joins – Bringing 2+ tables together
  • Section 13 Subqueries - How to nest queries
  • Section 14 Security - The basics
  • Section 15 Views - A way of storing queries
  • Section 16 Summary - Course Wrap up
  • Section 17 Extra Material

What You’ll Learn

  • Use SQL to answer real questions, Write advanced queries, like joins, groups and subqueries, Become comfortable putting SQL and PostgreSQL on your resume, Use available functions and operators in SQL, Understand important database concepts, Create your own databases

Reviews

  • J
    Jeremy Haakenson
    4.0

    Good introduction to SQL.

  • M
    Mandy Eickmeyer
    5.0

    Good examples!

  • M
    Mat Kreven
    5.0

    Best SQL course for me so far: well explained right from the start!

  • R
    Randy Bailey
    5.0

    Perfect for me learning SQl as real novice

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