php - 通过 greatest() 检测查询字段

Question

我正在使用 mysql GREATEST()函数从任一列(苹果或桃子)中选择最高的整数值。

+----+------------------+
| id | apples | peaches |
+----+------------------+
|  1 |    8   |    4    |
|  2 |    2   |    6    |
|  3 |    3   |    9    |
|  4 |    7   |    2    |
|  5 |    4   |    4    |
+----+------------------+

使用 $result = "SELECT GREATEST(apples, peaches) FROM table"; 和 echo $result，我得到:

8
6
9
7

在每个值旁边，我想回显相应的水果名称和一个水果图标。如何通过MYSQL查询实现下图？

另外，请注意 GREATEST() 函数不会显示相等的值。有没有办法也显示相等的值？

Answer 1

SELECT 
IF(apples >= peaches, apples, peaches) AS quantity,
IF(apples >= peaches, 'apples', 'peaches') AS fruit
FROM ...

或者，如果您不希望 apples 成为 equal 的默认值并且想知道两种水果何时被平等代表:

SELECT 
IF(apples >= peaches, apples, peaches) AS quantity,
CASE WHEN apples > peaches THEN 'apples' WHEN peaches > apples THEN 'apples' ELSE 'both' END AS fruit
FROM ...