訂購最高和最低

Question

我的問題是有關一個選擇，我想訂購由ASC和DESC字段，看一下例子：

我有表的產品，我要訂購的場所謂的價格，所以，我知道我能做到這一點：

SELECT Price FROM Products ORDER BY Price ASC. 

但我想看到的最高價和最低價，爲最高的，我知道我能做到：

SELECT Price FROM Products ORDER BY Price ASC limit 1; 

那麼，如何我可以選擇最高值和最低值，機器人h在1選擇？

我也想要選擇具有最高價值的產品的名稱和具有最低價值的產品。

問候。

Answer 1

這將顯示所有產品的最高價或最低價：

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

或者，也許你想是這樣的：

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) 

如果您希望他們在同一排，如果只有一個產品價格最高，而最低價格只有一個產品，則可以使用如下所示：

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，你可以這樣做：

(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

，如果你想看到兩個最高和最低的價格，使用此查詢：

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

怎麼樣使用簡單MIN和MAX聚合函數的

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

Answer 5

最簡單的方法是：

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

但在某些情況下，您可能希望使用UNION聲明：

(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)