UNION 2個表，（將它們結合起來）

Question

我Products_A

Product_ID Product_Name Price Quantity 
11   MilkA 36  56 3 
21   MeatB 123 78 23 
31   SugarA 29 45 333 

Products_B

Product_ID Product_Name Price Quantity 
21   MilkB 63  65 33 
22   MeatB 321 87 4345 
23   SugarB 92 54 232 

我想選擇這樣的查詢

Product_ID Quantity Quantity*Price 
11   36  
21   123 
31   29 
21   63 
22   321 
23   92 

我嘗試

SELECT 
    Products_A.Quantity, 
    Products_B.Quantity, 
    Products_A.Quantity * Products_A.Price, 
    Products_B.Quantity*Products_B.Price 
    FROM products_A, 
    products_B; 

但是這看起來沒有格式化。詳細信息

Answer 1

如果您想要兩個表的結果，可以使用UNION ALL。

SELECT 
    a.Product_Id as product_Id, 
    a.Quantity, 
    a.Quantity * a.Price as total 
FROM Products_A a 
UNION ALL 
SELECT 
    b.Product_Id as product_Id, 
    b.Quantity, 
    b.Quantity * b.Price as total 
FROM Products_B b