php - 明智地获取和显示记录部分

Question

3 个表quiz_sections、quiz_attempts 和question_attempts 表的列如下面所附的屏幕截图所示。

$USER->id 是当前登录的用户 ID 变量。

这是我的代码

<?php
echo "Current User ID : ".$USER->id."<br />";
$quizsections = mysql_query("SELECT * FROM quiz_sections");
while($quizsectionsrslt = mysql_fetch_array($quizsections)){
    echo $quizsectionsheading = $quizsectionsrslt['heading']."<br />";
    $quizsectionsquizid = $quizsectionsrslt['quizid'];
    $quizsectionsfirstslot = $quizsectionsrslt['firstslot'];
    $quizattempts = mysql_query("SELECT * FROM quiz_attempts WHERE `quiz`=$quizsectionsquizid AND `userid`=$USER->id");
    while($quizattemptsrslt = mysql_fetch_array($quizattempts)){
        $quizattemptsids = $quizattemptsrslt['id'];
        $quizattemptsattempt = $quizattemptsrslt['attempt'];
        $quizattemptsquiz = $quizattemptsrslt['quiz'];
        $questionattempts = mysql_query("SELECT * FROM question_attempts WHERE `questionusageid`=$quizattemptsids");
        while($questionattemptsrslt = mysql_fetch_array($questionattempts)){
            echo $questionattemptsid = $questionattemptsrslt['id'];
        }
    }
}

我得到的输出

我想拆分userid=3的结果

资质

1 2 3 4...10

算术

11 12 13 ...20

推理

21 22 23 ...30

计算机

31 32 33 ...40

userid=4 的结果从 41 到 80。

这些是表结构。

Answer 1

您需要在问题尝试查询中使用$quizsectionsfirstslot:

$questionattempts = mysql_query("SELECT * FROM question_attempts 
                                WHERE `questionusageid`=$quizattemptsids 
                                AND slot BETWEEN $quizsectionsfirstslot AND $quizsectionsfirstslot + 9");