Question

Table products:

id|name
-------
1 |computer
2 |microwave
3 |transl

Table product_features:

feature          | id_product | feature_value
------------------------------------
count_of_buttons | 1          | 1
count_of_buttons | 2          | 2
count_of_buttons | 3          | 1
color            | 1          | white
color            | 2          | white
color            | 3          | black

Pls, how to get all white products with one button?
Thank you very much!

Answer 1

select product.*

from product
  join product_features as buttons
    on buttons.id_product = product.id
  join product_features as color
    on color.id_product = product.id

where buttons.feature_value = '1'
  and buttons.feature = 'count_of_buttons'

  and color.feature_value = 'white'
  and color.feature = 'color';