How to find suppliers that sell all product or more than 1 product ?

There is 3 tables:
supplier (sid, name, address)
product (pid, productname)
catalog (pid, sid, price)

i want to know how to show suppliers that sell more than 1 product or maybe sell all product and how to find suppliers that have top 10 cheapest price.

thanks
adi.

Hi

Try below query.I haven't tested,but I think it will work

SELECT DISTINCT TOP (10) supplier.name,catalog.price
FROM supplier INNER JOIN
catalog ON supplier.sid = catalog.sid
ORDER BY catalog.price