Question

我在SQL中有Product表像这样：

productID   Type               Amount
1046          1                 4  
1046          1                 5  
1046          2                 10          
1047          1                 5           
1047          2                 3

如何进行查询，输出如下：

productID   Type          TotalTypeAmount    TotalPerProductID
1046          1                9                  19
1046          2                10                 19
1047          1                 5                  8
1047          2                 3                  8

Answer 1

这样我们也可以做到

rest:
  response: RESPONSE

@RestController
public class MyController {

    @Value("${rest.response}")
    private String restResponse;

    @GetMapping("/foo")
    public ResponseEntity<String> register() {
        return restResponse;
    }
}

Answer 2

更紧凑/专业的方式，也应该更快，因为它不需要加入：

SELECT 
  productID,
  Type,
  SUM(Amount) AS TotalTypeAmount,
  SUM(SUM(Amount)) OVER (PARTITION BY productID) as TotalPerProduct
FROM 
  Product
GROUP BY 
  productID,Type

http://sqlfiddle.com/#!6/ca308/4

Answer 3

如果您使用的是SQL Server或Postgres，则以下内容应该有效：

WITH CTE
AS
(
SELECT 
productID,
SUM(Amount) AS TotalAllType
FROM Product
GROUP BY productID
)

SELECT 
productID,
Type,
SUM(Amount) AS TotalTypeAmount
,TotalAllType
FROM Product AS P
LEFT JOIN CTE ON CTE.productID=P.productID
GROUP BY productID,Type, TotalAllType;

按所有值的查询分组

3 个答案: