“I tried to use Codecademy and DataCamp but felt that their learning modules were not interactive enough to keep me engaged.”

Sunishchal Dev

Lead Data Scientist @Booster

Course overview

In this course, you’ll learn how to identify and work with the various data types you’ll encounter in any data science role. Next, you’ll explore new concepts like functions, operators, expressions, and control flow. Finally, you’ll learn how to use them to optimize your work in a database.

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

Key skills

  • Defining binary operations and functions
  • Defining data types
  • Filtering results based on logical constraints
  • Ordering results

Course outline

Filtering and Sorting Data in SQL [7 lessons]

Datatypes and Column Operations 1h

Lesson Objectives
  • Identify different data types
  • Employ documentation
  • Execute operations between columns
  • Employ text operations
  • Define aliases

Functions 1h

Lesson Objectives
  • Define functions
  • Employ nested functions
  • Resolve missing values

Filtering I — Logical Operators 1h

Lesson Objectives
  • Define expressions
  • Define conditions
  • Filter based on conditions with `WHERE`
  • Employ logical operators `NOT`, `AND`, and `OR`

Filtering II — Complex Expressions 1h

Lesson Objectives
  • Define comparison operators
  • Identify the order of execution
  • Employ the `BETWEEN` operator

Filtering III — Special Comparison Operators 1h

Lesson Objectives
  • Employ `LIKE` operator
  • Filter based on patterns
  • Avoid multiple uses of `OR` with `IN`
  • Define `NULL`
  • Check if an expression is `NULL`

Control Flow 1h

Lesson Objectives
  • Program if/then rules
  • Employ the `CASE` expression
  • Identify pitfalls of the `CASE` expression

The Dataquest guarantee


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


We believe so strongly in our paths that we offer a full satisfaction guarantee. If you complete a career path 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

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 your project portfolio

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

Challenge yourself with exercises

Challenge yourself with exercises

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

Showcase your path certification

Showcase your path certification

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

Grow your career with

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Aaron Melton

Business Analyst at Aditi Consulting

“Dataquest starts at the most basic level, so a beginner can understand the concepts. I tried learning to code before, using Codecademy and Coursera. I struggled because I had no background in coding, and I was spending a lot of time Googling. Dataquest helped me actually learn.”


Jessica Ko

Machine Learning Engineer at Twitter

“I liked the interactive environment on Dataquest. The material was clear and well organized. I spent more time practicing then watching videos and it made me want to keep learning.”


Victoria E. Guzik

Associate Data Scientist at Callisto Media

“I really love learning on Dataquest. I looked into a couple of other options and I found that they were much too handhold-y and fill in the blank relative to Dataquest’s method. The projects on Dataquest were key to getting my job. I doubled my income!”

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