SQL Count from INNER JOIN

Question

How can I select the count from an inner join with grouping?

SELECT COUNT(table1.act) FROM table1
INNER JOIN table2 ON table1.act = table2.act
GROUP BY table1.act

This will return the count of act's found in table2.

Adding

 SELECT table1.act, COUNT(table1.act) AS test

Returns

act     test
------- ----
17682   3
17679   3
17677   3
11636   1
11505   1

I want to receive the count of act's found total.

So I want to get 5. Can you help?

Answer 1

You can wrap that query into another query:

SELECT COUNT(*) FROM (
    SELECT COUNT(table1.act) AS actCount FROM table1
    INNER JOIN table2 ON table1.act = table2.act
    GROUP BY table1.act
) t