I encourage you to follow along with these examples and run these queries for yourself. Note: I've cleaned up the psql output in these examples to make it easier to read, so don't worry if the output shown here isn't exactly what you've seen in your terminal. You are now connected to database "fcc" as user "john". Next let's start the interactive console by using the command psql, and connect to the database we just made using \c : $ psql
With PostgreSQL already installed, we can run the command createdb at our terminal to create a new database. If you have another database client that you enjoy working with that's fine too. To work with our PostgreSQL database, we can use psql-the interactive PostgreSQL command line program. Setting up example data (creating sales)īefore we can write our queries we need to setup our database.įor these examples we'll be using PostgreSQL, but the queries and concepts shown here will easily translate to any other modern database system (like MySQL, SQL Server, and so on).
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In this article we'll look at how to construct a GROUP BY clause, what it does to your query, and how you can use it to perform aggregations and collect insights about your data. The GROUP BY clause is a powerful but sometimes tricky statement to think about.Įven eight years later, every time I use a GROUP BY I have to stop and think about what it's actually doing.
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