Question

我从最近十个条目中选择了工作，但我不确定如何从这十个条目中获得最受欢迎的条目？另外，我如何计算最受欢迎的条目和数量？把它输出到一个百分比？

<?php 
    $sql = "SELECT data FROM table_answers ORDER BY id DESC LIMIT 10"; 
    $result = mysql_query ($sql, $db); 
    while ($row = mysql_fetch_array ($result)) 
    { 
         echo "[".$row['data']."]"; 
    } 
?>

我也尝试过WHERE值，但它不会返回任何结果。

$sql = "SELECT data FROM table_answers WHERE id IN (SELECT id FROM table_answers
         ORDER BY id DESC LIMIT 10) ORDER BY popularity DESC LIMIT 1"; 
$result = mysql_query ($sql, $db); 
    while ($row = mysql_fetch_array ($result)) 
    { 
        echo " [".$row['data']."] ";  
    }

任何人都知道我在这里做错了什么？请

Answer 1

SELECT data
FROM (
    SELECT data
    FROM table_answers
    ORDER BY id DESC
    LIMIT 10
) t
ORDER BY popularity

Answer 2

这应解决问题 -

SELECT tableorder.* 
FROM (SELECT * 
      FROM table
      ORDER BY id DESC 
      LIMIT 10) tableorder 
ORDER BY tableorder.popularity DESC 
LIMIT 1

内部查询将基于id进行排序并获得前10名。外部将根据流行度再次对10行进行排序，并返回最受欢迎的行。

从输入的最后十个值中选择最常用的条目

2 个答案: