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SQL COUNT(*) Tutorial - Interactive Database Lesson

Lesson 12 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(*)

Interactive SQL Tutorial

Another way to explore a table is to check the number of rows in it. For example, if we are querying a table states_of_us, we’d expect 50 rows, or 500 rows in a table called fortune_500_companies.

SELECT COUNT(*) FROM friends_of_pickles; returns the total number of rows in the table friends_of_pickles. Try this for yourself.

SQL:

Query Result:

Available Tables:

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