SQL: How to get the count of each distinct value in a column?

Question

I have a SQL table called \"posts\" that looks like this:

id | category
-----------------------
1  | 3
2  | 1
3  | 4
4  | 2
5  | 1
6  | 1
7  | 2

Answer 1

SELECT
  category,
  COUNT(*) AS `num`
FROM
  posts
GROUP BY
  category