SQL 2 INNER JOINS with 3 tables
- by Jelmer Holtes
I've a question about a SQL query.. I'm building a prototype webshop in ASP.NET Visual Studio. Now I'm looking for a solution to view my products. I've build a database in MS Access, it consists of multiple tables.
The tables which are important for my question are:
Product
Productfoto
Foto
Below you'll see the relations between the tables
For me it is important to get three datatypes: Product title, price and image.
The product title, and the price are in the Product table. The images are in the Foto table.
Because a product can have more than one picture, there is a N - M relation between them. So I've to split it up, I did it in the Productfoto table.
So the connection between them is:
product.artikelnummer -> productfoto.artikelnummer
productfoto.foto_id -> foto.foto_id
Then I can read the filename (in the database: foto.bestandnaam)
I've created the first inner join, and tested it in Access, this works:
SELECT titel, prijs, foto_id
FROM Product
INNER JOIN Productfoto
ON product.artikelnummer = productfoto.artikelnummer
But I need another INNER JOIN, how could I create that? I guess something like this (this one will give me an error)
SELECT titel, prijs, bestandnaam
FROM Product
(( INNER JOIN Productfoto ON product.artikelnummer = productfoto.artikkelnummer )
INNER JOIN foto ON productfoto.foto_id = foto.foto_id)
Can anyone help me?
