Group Things Together
Explore how to group rows by shared values in SQL and use aggregate functions to calculate totals, averages, and counts for each group. Learn essential GROUP BY rules to write effective queries that summarize data accurately.
We'll cover the following...
We'll cover the following...
You already know how to calculate totals, averages, and counts. But what if you want those numbers for each group, like each city or pet type? Instead of just “How many pets?” You want: “How many pets of each type?” That’s where GROUP BY shines.
Goal
You’ll aim to:
Group rows by a shared value (like city ...