5 Most Useful Window Functions In SQL You Should Know

5 Most Useful Window Functions In SQL You Should Know

Take your SQL skills to the next level. In this article, I’m going to share what I think are the 5 MOST useful window (analytics) functions.

Introduction

In my last article, I explained what SQL window functions are and how they can be used. In this article, I’m going to share what I think are the 5 MOST useful window (analytics) functions.

I highly recommend that you try to understand these if you work with data in your job (i.e. data analysts, product analysts, data scientists, data engineers, etc…). They will certainly come in handy!

With that said, let’s dive right into it.

To help you understand how these 5 window functions work, I’m going to use the following table as an example:

1. Row Number

What does it do?

ROW_NUMBER simply returns the number of each row, starting at 1 for the first record.

When is it Useful?

Row number is extremely useful when you want to get the first or last record of a specific table. For example, if you have a table of customer purchases and you want to get the first purchase for each customer, you can PARTITION BY customer (name/id) and ORDER BY purchase date. Then you can filter the table WHERE row number = 1.

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