SQL 101: Introduction to Database Queries

Mark Florian, Software Developer

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12 Videos (1h 29m)
    • Trailer

    • What is SQL?

    • Installing SQLite Manager and creating our database

    • Creating tables and inserting data into tables

    • Single Table Queries (Simple)

    • Solutions: Single Table Queries (Simple)

    • Single Table Queries (Advanced)

    • Solutions: Single Table Queries (Advanced)

    • Joins

    • Solutions: Joins

    • Subqueries

    • Solutions: Subqueries

27 students are watching this class

About This Class

SQL is the database language that allows you to understand the data behind almost every website and internet company.

I've been at a tech company for a couple years and have learned one universal truth: data rules all. The most common request I get as a software engineer is to "pull some data" from our database. What I've realized is that about 95% of these requests involve a very basic query that could be performed by any one of my colleagues.

With the information in this class, you'll be better able to understand, access, and measure your user data and behavior. Whether you are an entrepreneur, analyst, or marketer, SQL can help you execute smarter and faster! 


What You'll Learn

  • SQL Fundamentals. We will talk about relational databases and what SQL can do with a relational database.
  • Setting Up Our Environments. We will set up our environments so that we can run SQL commands together.
  • Creating Data. You will create your own table and populate it with data.
  • Single Table Queries. We will cover the basics that will allow you to pull any combination of information from a single table, including FROM, WHERE, GROUP BY, COUNT, SUM, HAVING, SELECT, and ORDER BY.
  • Joins. We will cover Joins and how they are important for defining relational data between tables.
  • Subqueries. You will convert Joins into equivalent subqueries.

The Project

  • Deliverable. Your final project will be to create a database and query it in SQL.
  • Guiding Questions. What kind of data will you create? How will you categorize this data? How will your data sets relate to each other? What is the correct way to retrieve data? 
  • Collaboration. Ask your fellow classmates for feedback on your data set. How could you create more precise data points? What retrieval methods work best for solving your queries from their perspective?

By the end of the course, you will have created your own query-searchable database using SQLite, and you'll be able to edit and query data on your own.

Let's get started! 

93 of 96 students recommendSee All

This is a good course for brushing up on SQL, the instructor is very informative and has a few sections where you can work on some homework problems alone.
This course is amazing. I'm relatively new to doing SQL for an enormous database with multitudes of tables. I've been beating my head into a brick wall for hours over one little thing... and no joke, Mark goes over the EXACT thing I needed to know in the Solutions: Subqueries video. It's something I've not seen in any other course I've taken and I've taken "deep dives" and even a 16 day course so far. I could not thank him enough, he just saved me such a headache!
Channon Dishman-Flores

Jr DBA, IT Professional, Author

Very helpful





Mark Florian

Software Developer

I am a full-stack engineer for a tech startup in New York. While I develop for more than just the data layer of an application, I find that database knowledge is the most valuable for someone in a non-technical or analytics role. I have taught dozens of students and colleagues the basics of SQL to enable them to work more efficiently, and I'm excited to share this knowledge with a wider audience.

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