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SQL COUNT(*) ... WHERE Tutorial - Filter Database Records

Lesson 13 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

COUNT(*) ... WHERE

Interactive SQL Tutorial

We can combine COUNT(*) with WHERE to return the number of rows that matches the WHERE clause.

For example, SELECT COUNT(*) FROM friends_of_pickles WHERE species = 'human'; returns 2.

Can you return the number of rows in friends_of_pickles where the species is a dog?

SQL:

Query Result:

Available Tables:

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