Drill 9: Teach it — Joins
Explain the example to someone who has never seen it.
What you will be able to do
- Explain the example to someone who has never seen it.
Practice task
Explain the example to someone who has never seen it.
SELECT c.title AS course, COUNT(l.id) AS lessons
FROM courses c
LEFT JOIN lessons l ON l.course_slug = c.slug
GROUP BY c.title
ORDER BY lessons DESC;Your turn
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Explain the example to someone who has never seen it.
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