如果我有以下SQL数据库，我该如何获取此信息？

Question

尝试一劳永逸地学习TSQL：P

我想选择按类别订购的Productos列表。

修改

以下是我在您的帮助下创建的查询，但它仍未显示我想要的内容：

select p.Nombre as Nombre, c.Nombre as Categoria FROM Producto as p
inner join Subcategoria as s ON p.IDSubcategoria = s.ID
inner join Categoria as c on s.IDCategoria = c.ID
group by p.Nombre, c.Nombre
order by p.Nombre

结果：

所以它会显示：

Product Name, Product count, that has category X
Product Name, Product count, that has category X
Product Name, Product count, that has category X
Product Name, Product count, that has category X

Answer 1

出了我的脑袋，假设Proveedor中的记录数是计数：

SELECT p.Nombre as Name, COUNT(pr.*), c.Nombre as Category FROM Producto as p
INNER JOIN Subcategoria as s ON p.IDSubcategoria = s.ID
INNER JOIN Categoria as c on s.IDCategoria = c.ID
INNER JOIN Proveedor as pr ON p.IDProveedor = pr.ID
GROUP BY p.Nombre, c.Nombre
ORDER BY p.Nombre

如果有一些错误，请不要开枪。