在sql數據庫中加入2個表或外鍵？

Question

我想從Products表中獲取產品名稱到CustomerProducts表。

Products表：

customerproducts表：

UPDATE：

public void bindgrid() 
    { 
     SqlConnection conn = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True"); 
     SqlCommand cmd = new SqlCommand("select Name From Products p InnerJoin CustomerProducts cp ON(p.ProductID = cp.ProductID)", conn); 

     SqlDataAdapter da = new SqlDataAdapter("", conn); 
     da.SelectCommand = new SqlCommand("select ProductName From Products p InnerJoin CustomerProducts cp ON(p.ProductID = cp.ProductID", conn); 
     DataSet ds = new DataSet(); 
     da.Fill(ds, "data"); 
     GridView1.DataSource = ds.Tables[0].DefaultView; 
     GridView1.DataBind(); 
    } 

Answer 1

如果你想把它當作一個選擇：

SELECT cp.customerID,cp.productID,p.name 
FROM products p 
INNER JOIN customerProducts cp 
ON(p.productID = cp.productID) 

如果你想添加一列第二表來，首先添加列，然後更新：

UPDATE customerProducts cp 
SET cp.name = (SELECT p.name FROM products p 
       WHERE p.productID = cp.productID)