Using SQL query to find details of customers who ordered > x types of products

Question

Please note that I have seen a similar query here, but think my query is different enough to merit a separate question.

Suppose that there is a database with the fol

Answer 1

You could do it more simply:

select

    c.id,
    c.cname,
    count(distinct o.pid) as `uniques`

from o join c
on c.id = o.cid

group by c.id

having `uniques` > 10