95. Order of SQL commands execution in a query with JOINs

We’re not far away from learning all possible SQL keywords. I hope you remember all steps of they execution by heart. Let’s go over them to make sure it’s the case:

  1. FROM is checked first, SQL engine will know from which table to read records first
  2. JOIN goes second. The records from JOIN tables are also read and joined with our main table ☝
  3. WHERE comes next – we filter the records from the final big table
  4. GROUP BY splits final big table into smaller groups
  5. SELECT is processed next, columns and results of all functions are calculated
  6. DISTINCT...
“well worth the money”
Sign up and check out 36 free lessons and exercises.

Anatoli Makarevich, author of SQL Habit About SQL Habit

Hi, it’s Anatoli, the author of SQL Habit. 👋

SQL Habit is a course (or, as some of the students say, “business simulator”). It’s based on a story of a fictional startup called Bindle. You’ll play a role of their Data Analyst 📊 and solve real-life challenges from Business, Marketing, and Product Management.

SQL Habit course is made of bite-sized lessons (you’re looking at one atm) and exercises. They always have a real-life setting and detailed explanations. You can immediately apply everything you’ve learned at work. 🚀

“well worth the money”

Fluent in SQL in a month

Master Data Analysis with SQL with real life examples from Product Management, Marketing, Finance and more.
-- Type your query here, for example this one -- lists all records from users table: SELECT * FROM users
LIMIT 500
Loading chart... ⏳
Previous lesson: JOIN + Aggregate Functions = ❤
Next exercise: Identifying the most popular book in the catalogue