Key Concepts

Review core concepts you need to learn to master this subject

Column References

SELECT COUNT(*) AS 'total_movies', rating FROM movies GROUP BY 2 ORDER BY 1;

The GROUP BY and ORDER BY clauses can reference the selected columns by number in which they appear in the SELECT statement. The example query will count the number of movies per rating, and will:

  • GROUP BY column 2 (rating)
  • ORDER BY column 1 (total_movies)
Aggregate Functions
Lesson 1 of 1

What you'll create

Portfolio projects that showcase your new skills

Pro Logo

How you'll master it

Stress-test your knowledge with quizzes that help commit syntax to memory

Pro Logo