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SQL AVG Tutorial - Interactive Database Lesson

Lesson 15 of 31

Lessons

1. SELECT *
2. SELECT specific columns
3. WHERE ... Equals
4. WHERE ... Greater than
5. WHERE ... Greater than or equal
6. AND
7. OR
8. IN
9. DISTINCT
10. ORDER BY
11. LIMIT # of returned rows
12. COUNT(*)
13. COUNT(*) ... WHERE
14. SUM
15. AVG
16. MAX and MIN
17. GROUP BY
18. Nested queries
19. NULL
20. Date
21. Inner joins
22. Multiple joins
23. Joins with WHERE
24. Left joins
25. Table alias
26. Column alias
27. Self joins
28. LIKE
29. CASE
30. SUBSTR
31. COALESCE

AVG

Interactive SQL Tutorial

We can use the AVG keyword in order to find the average of a given value.

For example, running SELECT AVG(num_legs) FROM family_members; returns the average number of legs of each family member.

Can you find the average num_books_read made by each family member?

Note:
- Because of the way computers handle numbers, averages will not always be completely exact.

SQL:

Query Result:

Available Tables:

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