Day: April 8, 2024

Introduction 介绍 So far, you’ve learned how to use several SQL clauses. For instance, you know how to use SELECT to pull specific columns from a table, along with WHERE to pull rows that meet specified criteria. You also know how to use aggregate functions like COUNT(), along with GROUP BY to treat multiple rows […]

This notebook is an exercise in the SQL course. You can reference the tutorial at this link. Introduction 介绍 Queries with GROUP BY can be powerful. There are many small things that can trip you up (like the order of the clauses), but it will start to feel natural once you’ve done it a few […]