Question

我有一张这样的桌子：

---------------------------------------
| S No | item     | Col1      | Col2  |
| ------------------------------------|
| 1    | carrot   | 111       | 2     |
| 2    | broccoli | 222       | 3     |
| 3    | spinach  | 333       | 2     |
| 4    | swiss    | 444       | 3     |
| 5    | cheddar  | 5555      | 5     |
| 6    | cheddar  | 6666      | 6     |
| 7    | onion    | 7777      | 3     |

Col1，Col2，Coln等列有很多列，包含所有整数值。我想获取所有列的总和并获得前5列的名称，其名称和总和值作为查询的响应。我可以用前5个记录做到这一点，但发现很难用列。我正在为这样的行做这件事：

$q1 = mysqli_query($con, "SELECT `File Name`, `Kudos` FROM `{$_SESSION['username']}` ORDER BY `Kudos` DESC LIMIT 5");

while($row = mysqli_fetch_array($q1)) {
    $myCols[] = $row;
} 
print_r($myCols); // Works fine

print_r给了我：

Array
(
    [0] => Array
        (
            [0] => AAAA
            [File Name] => AAAA
            [1] => 343
            [Kudos] => 343
        )

    [1] => Array
        (
            [0] => Test File Again
            [File Name] => Test File Again
            [1] => 45
            [Kudos] => 45
        )

    [2] => Array
        (
            [0] => TEST FILE
            [File Name] => TEST FILE
            [1] => 3
            [Kudos] => 3
        )

)

看起来不错。对于具有整列最大总和值的列，我该如何相同？有谁在那里？谢谢！

Answer 1

只需添加它们并在order by：

中使用它们

SELECT `File Name`, (col1 + col2 + col3 . . . ) as totalsum
FROM `{$_SESSION['username']}
ORDER BY totalsum DESC
LIMIT 5;

如何通过降序排列前五列总和？

1 个答案: