仅在相同的ID中显示一行

Question

我想问一下如何只在同一个id中显示一行，在下面的示例中，我只想在表中显示最高分数结果。

这是我的代码

    $query = "SELECT * FROM memberdata ORDER BY score DESC";
    echo "<table border=1>
    <tr>
    <th> id </th>
    <th> score </th>

    </tr>";

    while($row = mysqli_fetch_array($result)) {

        echo "<tr>";
        echo "<td>" . $row['id'] . "</td>";
        echo "<td>" . $row['score'] . "</td>";
        echo "</tr>";
    }

    echo "</table>";

输出

id score 
1  5000
1  4000
1  3000
1  500
2  3000
2  1000

Answer 1

使用分组

SELECT id, MAX(score) AS score FROM memberdata GROUP BY id

Answer 2

试试这个：

SELECT id, MAX(score) AS score FROM memberdata GROUP BY id

或者这个：

SELECT * FROM memberdata ORDER BY score DESC LIMIT 1

Answer 3

您需要先迭代才能找到maxrow。

    $query = "SELECT * FROM memberdata ORDER BY score DESC";
    echo "<table border=1>
    <tr>
    <th> id </th>
    <th> score </th>

    </tr>";

    $maxrow = mysqli_fetch_array($result);
    while($row = mysqli_fetch_array($result)) {
        if ($maxrow['score'] > row['score']) maxrow = row;
    }
    echo "<tr>";
    echo "<td>" . $maxrow['id'] . "</td>";
    echo "<td>" . $maxrow['score'] . "</td>";
    echo "</tr>";
    echo "</table>";