Question

我的问题与Select有关，我想通过ASC和DESC订购一个字段，看看例子：

我有产品表，我想订购的字段叫做Price，所以，我知道我可以这样做：

SELECT Price FROM Products ORDER BY Price ASC.

但我希望看到最高价格和最低价格，我知道我能做到的最高价格：

 SELECT Price FROM Products ORDER BY Price ASC limit 1;

那么，如何在1选择中选择最高值和最低值？

我还想选择价值最高的产品名称和最低价格的产品。

问候。

Answer 1

如何使用简单的MIN和MAX聚合函数

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

Answer 2

这将显示所有具有最高价格或最低价格的产品：

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

或许你想要这样的东西：

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)

如果您希望它们位于同一行，并且只有一种产品具有最高价格且只有一种具有最小价格，则可以使用以下内容：

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，如果你只需要一些更简单的东西，你可以使用它：

(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 3

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

Answer 4

如果您想查看最高价和最低价，请使用此查询：

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 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)

按最高和最低排序

5 个答案: