Question

如何修改下面的查询以在$submission等于$row["title"]的行之前显示数据库中的5行？（当行按points降序排序时。）

$sqlStr = "SELECT title, points, submissionid
             FROM submission 
         ORDER BY points DESC"; 


$result = mysql_query($sqlStr);

$arr = array();

$count=1;

echo "<table class=\"samplesrec\">";

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


    echo '<tr >';

    echo '<td>'.$count++.'.</td>';

    echo '<td class="sitename1">'.$row["title"].'</td>';

    echo '<td class="sitename2"><div class="pointlink2">'.number_format($row["points"]).'</div></td>';
    echo '</tr>';

}

echo "</table>";

Answer 1

当然可以。使用where子句将搜索限制为仅在您要通过值引用的元素之前的元素，然后反向排序它们并使用limit来获取前五个。

可能更容易获得结果，然后在php中执行此操作，而不是尝试在mysql中执行此操作。

Answer 2

此查询应该可以解决问题：

SELECT title, points, submissionid
FROM   submission s
        ,(SELECT s1.points
          FROM   submission s1
          WHERE  s1.title = $submission
          LIMIT  1) p
WHERE  points > p.points
ORDER  BY points
LIMIT  5

如果您想要逆转订单：

SELECT * FROM (
    SELECT title, points, submissionid
    FROM   submission s
          ,(SELECT s1.points
            FROM   submission s1
            WHERE  s1.title = $submission
            LIMIT  1) p
    WHERE  points > p.points
    ORDER  BY points
    LIMIT  5) x
ORDER  BY points DESC

显示字段等于变量的行前面的5行

2 个答案: