订购最高和最低

Question

我的问题是有关一个选择，我想订购由ASC和DESC字段，看一下例子：

我有表的产品，我要订购的场所谓的价格，所以，我知道我能做到这一点：

SELECT Price FROM Products ORDER BY Price ASC. 

但我想看到的最高价和最低价，为最高的，我知道我能做到：

SELECT Price FROM Products ORDER BY Price ASC limit 1; 

那么，如何我可以选择最高值和最低值，机器人h在1选择？

我也想要选择具有最高价值的产品的名称和具有最低价值的产品。

问候。

Answer 1

这将显示所有产品的最高价或最低价：

SELECT Products.* 
FROM Products 
WHERE Price = (SELECT MAX(Price) FROM Products) 
     OR Price = (SELECT MIN(Price) FROM Products) 

或者，也许你想是这样的：

SELECT 
    Products.*, 
    m.mx As Highest, 
    m.mn As Lowest, 
    CASE WHEN Products.Price = m.mx THEN 'Max' ELSE 'Min' END As Is_Max_or_Min 
FROM 
    Products INNER JOIN (
    SELECT MAX(Price) mx, MIN(Price) mn 
    FROM Products 
) m ON Products.Price IN (m.mx, m.mn) 

如果您希望他们在同一排，如果只有一个产品价格最高，而最低价格只有一个产品，则可以使用如下所示：

SELECT 
    m.Lowest, p1.Name Name_Lowest, 
    m.Highest, p2.Name Name_Highest 
FROM 
    (SELECT MIN(Price) Lowest, MAX(Price) Highest FROM Products) m 
    INNER JOIN Products p1 ON m.Lowest = p1.Price 
    INNER JOIN Products p2 ON m.Highest = p2.Price 
LIMIT 1 

或者，如果你只是需要一些easyer，你可以这样做：

(SELECT 'Max' Is_Max_Or_Min, Products.* 
FROM Products ORDER BY Price DESC LIMIT 1) 
UNION ALL 
(SELECT 'Min', Products.* 
FROM Products ORDER BY Price LIMIT 1) 

Answer 2

SELECT Price FROM Products ORDER BY Price DESC limit 1; ??

Answer 3

，如果你想看到两个最高和最低的价格，使用此查询：

select highest, lowest from 
(
SELECT Price as highest FROM Products ORDER BY Price DESC limit 1; 
SELECT Price as lowest FROM Products ORDER BY Price ASC limit 1; 
) t 

Answer 4

怎么样使用简单MIN和MAX聚合函数的

SELECT MAX(Price) as MaxPrice, MIN(Price) as MinPrice FROM Products 

Answer 5

最简单的方法是：

SELECT MIN(Price) LowestPrice, MAX(Price) HighestPrice FROM Products 

但在某些情况下，您可能希望使用UNION声明：

(SELECT 'Lowest' type, Price FROM Products ORDER BY Price ASC LIMIT 1) 
UNION 
(SELECT 'Highest' type, Price FROM Products ORDER BY Price DESC LIMIT 1)