SQL field with multiple id's of other table

Question

Could someone give me an idea how to create this database structure. Here is an example:

Table \"countries\":
id, countryname
1, \"US\"
2, \"DE\"
3, \"FR\"
4         


        

Answer 1

You need an intersection table for that many-to-many relationship.

Table Country
CountryID, CountryName

Table CountryProduct
CountryID, ProductID

Table Product
ProductID, ProductName

You then Inner Join all 3 tables to get your list of Countries & Products.

Select * From Country 
Inner Join CountryProduct On Country.CountryID = CountryProduct.CountryID 
Inner Join Product On CountryProduct.ProductID = Product.ProductID