How do i count the number of items in a table and join with categories from different table in mysql database

Question

I am trying to select count distinct items from Table 2 and match it to the category list in Table 1. This is a MySQL database sample.

Table 1 (categories):

id   group_name
1      football
2      hockey
3      tennis

Table 2 (users):

id   groups
1      tennis
2      football
3      football
4      tennis
5      football
6      hockey
7      hockey

Answer 1

The below SQL query would do it:

SELECT A.GROUP_NAME, COUNT(DISTINCT GROUPS) CNTS 
FROM CATEGORIES A
LEFT JOIN USERS B
ON A.GROUP_NAME = B.GROUPS