MySQL select join where AND where

Question

I have two tables in my database:

Products

• id (int, primary key)
• name (varchar)

ProductTags

Answer 1

you need to have a group by / count to ensure all are accounted for

select Products.*
  from Products 
         join ( SELECT Product_ID
                  FROM ProductTags
                  where ProductTags.tag_id IN (1,2,3)
                  GROUP BY Products.id
                  having count( distinct tag_id ) = 3 ) PreQuery
        on ON Products.id = PreQuery.product_id