mysql n:m relationship: Find rows with several specific relations

Question

I have two SQL Tables, \'products\' and \'tags\'. They have an n:m relationship, using a third table \'product_tags\'.

I want to use a query to find every product that h

Answer 1

You can use this solution. This gets all products that contain ALL keywords 1, 23, and 54:

SELECT a.*
FROM products a
INNER JOIN product_tags b ON a.product_id = b.product_id
WHERE b.tag_id IN (1,23,54)
GROUP BY a.product_id
HAVING COUNT(1) = 3

Where 3 is the number of items in your WHERE IN list, so you can adjust accordingly based on the amount of tags you want to check on.