Getting the number of rows with a GROUP BY query

Question

I have a query to the effect of

SELECT t3.id, a,bunch,of,other,stuff FROM t1, t2, t3 
WHERE (associate t1,t2, and t3 with each other) 
GROUP BY t3.id 
LIMIT          


        

Answer 1

Are the "bunch of other stuff" all aggregates? I'm assuming so since your GROUP BY only has t3.id. If that's the case then this should work:

SELECT
     COUNT(DISTINCT t3.id)
FROM...

The other option of course is:

SELECT
     COUNT(*)
FROM
     (
     
     ) AS SQ

I don't use MySQL, so I don't know if these queries will work there or not.