database design - Best way to store categories and product type in DB -

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i have 3 product types. more later. have product categories. category can't have multiple product type. so, how should keep categories.

1.id | parent_id | name

i'll set product types root categories.
example:

electronic > computer > laptop

electronic's parent id 0 , next categories linked due that.

  1. id | parent_id | product_type | name

i'll electronic product_type , computer's parent_id 0.

which way better?

for categories:

id | name | parent_id

(parent id category tree)

for products:

id | category_id | name | description | other

let's category tree like

computers [id: 1 | parent: 0]  |-laptops [id: 2 | parent: 1]  |-desktop [id: 3 | parent: 1]  |-printers [id: 4 | parent: 1]  |  |-brand #1 [id: 5 | parent: 4]  |  |-brand #2 [id: 6 | parent: 4]  |-other stuff [id: 7 | parent: 1]

then, if want display products from, example, printers, recursion getting items printers category , subcategories.

tl;dr

the first way better


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