Question

I have 3 tables:

section
=======
id

cat
===
id
section_id

product
=======
id
cat_id

and I would like to select all the products matching a certain section. Is there a way to do this in a single query?

Answer 1

Get all data related to the section :

SELECT * FROM product
INNER JOIN cat ON cat.id=product.cat_id
INNER JOIN section ON section.id=cat.section_id
WHERE section.id = 5

Slightly faster solution which will ignore the section table altogether.

SELECT * FROM product
INNER JOIN cat ON cat.id=product.cat_id
WHERE cat.section_id = 5