Question

I’ve got the database with 3 tables:

product (id, name, price, ...)
product_option (id, product_id, option_id)
option (id, value)

products have many options

For example I need to find a product with option A and option B and not a product with just an option A.

I’m using somethink like this:

select * from product
left join product_option on product_option.product_id = product_id

where product_option.option_id in (1,2,3) 
and product_option.option_id in (4)
group by product.id

Of course the result is always empty.
I need those products with option_id (1 or 2 or 3) and 4

How can I do that?

Answer 1

as you want two difrent matches, you need to join the product_option twise

select * from product
left join product_option AS po1 on product_option.product_id = product_id
left join product_option AS po2 on product_option.product_id = product_id

where po1.option_id in (1,2,3) 
and po2.option_id in (4)
group by product.id