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

This is easiest to generalise by putting the search values into a table...

INSERT INTO search SELECT 1
         UNION ALL SELECT 2
         UNION ALL SELECT 3

SELECT
  camera_features.camera_id
FROM
  camera_features
INNER JOIN
  search
    ON search.id = camera_features.feature_id
GROUP BY
  camera_features.camera_id
HAVING
  COUNT(DISTINCT camera_features.feature_id) = (SELECT COUNT(DISTINCT id) FROM search)