如何在mysql中更改查询，使其随机检索30行

Question

我想在我的WordPress插件中修改这个查询，这样它就可以从100行中随机检索30行。

$query = $wpdb->prepare("
    SELECT
        p.*, qq.quiz_id, qq.question_order AS order
    FROM
       {$wpdb->posts} p 
    INNER JOIN
       {$wpdb->prefix}learnpress_quiz_questions qq ON p.ID = qq.question_id
    WHERE
       qq.quiz_id IN (" . join( ',', $format ) . ")
    AND
       p.post_status = %s
", $args );

我已经把它改成这样了，但它仍然不起作用。有谁能帮帮我吗？

SELECT
    p.*, qq.quiz_id, qq.question_order AS order
FROM
    {$wpdb->posts} p 
INNER JOIN
    {$wpdb->prefix}learnpress_quiz_questions qq ON p.ID = qq.question_id
WHERE
    qq.quiz_id IN (" . join( ',', $format ) . ")
AND
    p.post_status = %s
ORDER BY
    RAND() LIMIT 30

Answer 1

将您的排序更改为如下所示：

order by RAND() * 30

或者，如果你有一个整型id：

order by RAND() * id