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我的问题与 Select 有关，我想按 ASC 和 DESC 排序字段，请看示例：

我有表格产品，我要订购的字段称为价格，所以，我知道我可以这样做：

SELECT Price FROM Products ORDER BY Price ASC.

但我想看看最高价格和最低价格，因为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 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的产品名称。

问候。

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5 回答 5

4

MIN简单和MAX聚合函数的使用怎么样

SELECT MAX(Price) as MaxPrice, MIN(Price) as MinPrice FROM Products
于 2013-04-13T20:52:21.300 回答
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)

或者，也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，而只有一种产品具有最低价格，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，如果您只需要更简单的东西，您可以使用这个：

(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)
于 2013-04-13T21:21:44.133 回答
0

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

于 2013-04-13T20:49:35.100 回答
0

如果您想同时查看最高和最低价格，请使用以下查询：

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
于 2013-04-13T20:51:45.440 回答
0

最简单的方法是：

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

但在某些情况下，您可能希望使用以下UNION语句：

(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)
于 2013-04-13T20:58:07.467 回答