Mysql UNION 2表（组合它们）

我有产品

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

产品

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

我希望像这样选择查询

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

我试着

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但这看起来是无格式的。详细信息

如果您想要两个表的结果，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

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在SQL查询中搜索UNION！谢谢拉斐尔，你忘记了b中的逗号，但这是给未来的访客的。

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