Can you solve this simple SQL query?

Question

Suppose it\'s a website that sells photo cameras. Here are my entities (tables):

Camera: A simple camera
Feature: A feature like: 6mp, max resolution 1024x76         


        

Answer 1

SELECT camera.id
FROM camera JOIN camera_features ON camera.id=camera_features.camera_id
GROUP BY camera.id
HAVING sum(camera_features.feature_id IN (1,2,3))=3

3 is the number of features in (1,2,3). And assuming (camera_id,feature_id) is unique in camera_features.