Select results with only 2 types of products

I need to receive claims (of a customer) who has only specific types of products (productid IN(1,2)). There are different other products but I need only the ones with type 1 and 2 (who would have both at the same time). Client might have other products as well but important to take the ones who have 1&2

Example

clientID claimID productID
 123       333      1
 123       333      2
 123       333      4
 123       333      6
 123       333      7

>Solution :

SELECT C.clientID
FROM YOUR_TABLE AS C
WHERE C.productID IN(1,2)
GROUP BY C.clientID
HAVING COUNT(DISTINCT C.productID)=2