Selecting against subsets of a list in MySQL

Question

I\'m quite a begginer and I have two tables: \"product\" and \"product attributes\".

Here\'s some imaginary data (the actual stuff involves more tables )

Pr

Answer 1

let me post simple imaginary data ( the actual stuff involves more tables )

table products

product_id | product_name                  
10          |   aaa                           
11     |    bbb  

table product_attribute

attribute_id | product_id  <br>
21     |    10         
23     |    10         
24     |    10         
21     |    11         
24     |    11 

i want that:

• when I filter for (21,24) to be returned only product 11 (bbb)
  
• when I filter for (21,23,24) to be returned both products
  
• when I filter for (21) only to be returned none ( because no product has only that attribute )