Question

我正在进行在线能力测试，该测试将从数据库中挑选10个随机问题，并将其显示在网页上进行回答。

现在我在一张桌子上显示问题。

问题是我必须从每个3到4个表中挑选10个问题并随机显示而不重复问题。有人可以帮我解决这个问题吗？

<?php
session_start();
error_reporting(1);
include("database.php");
extract($_POST);
extract($_GET);
extract($_SESSION);
/*$rs=mysql_query("select * from mst_question where test_id=9",$cn) or die(mysql_error());
if($_SESSION[qn]>mysql_num_rows($rs))
{
unset($_SESSION[qn]);
exit;
}*/
if(isset($subid) && isset($testid))
{
$_SESSION[sid]=$subid;
$_SESSION[tid]=$testid;
header("location:quiz.php");
}
if(!isset($_SESSION[sid]) || !isset($_SESSION[tid]))
{
    header("location: index.php");
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Online Quiz</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="quiz.css" rel="stylesheet" type="text/css">
</head>

<body>
<?php
include("header.php");
$myDate = date('y/m/d');

$query="SELECT * FROM mst_question ORDER BY RAND() LIMIT 10";

$rs=mysql_query("select * from mst_question where test_id=9 ORDER BY RAND() LIMIT 10",$cn) or die(mysql_error());
if(!isset($_SESSION[qn]))
{
    $_SESSION[qn]=0;
    mysql_query("delete from mst_useranswer where sess_id='" . session_id() ."'") or die(mysql_error());
    $_SESSION[trueans]=0;

}
else
{   
        if($submit=='Next Question' && isset($ans))
        {
                mysql_data_seek($rs,$_SESSION[qn]);

                $row= mysql_fetch_row($rs); 
                mysql_query("insert into mst_useranswer(sess_id, test_id, que_des, ans1,ans2,ans3,ans4,true_ans,your_ans) values ('".session_id()."', 9,'$row[2]','$row[3]','$row[4]','$row[5]', '$row[6]','$row[7]','$ans')") or die(mysql_error());
                if($ans==$row[7])
                {
                            $_SESSION[trueans]=$_SESSION[trueans]+1;
                }
                $_SESSION[qn]=$_SESSION[qn]+1;
        }
        else if($submit=='Get Result' && isset($ans))
        {
                mysql_data_seek($rs,$_SESSION[qn]);
                $row= mysql_fetch_row($rs); 
                mysql_query("insert into mst_useranswer(sess_id, test_id, que_des, ans1,ans2,ans3,ans4,true_ans,your_ans) values ('".session_id()."', 9,'$row[2]','$row[3]','$row[4]','$row[5]', '$row[6]','$row[7]','$ans')") or die(mysql_error());
                if($ans==$row[7])
                {
                            $_SESSION[trueans]=$_SESSION[trueans]+1;
                }
                echo "<h1 class=head1> Result</h1>";
                $_SESSION[qn]=$_SESSION[qn]+1;
                echo "<Table align=center><tr class=tot><td>Total Question<td> $_SESSION[qn]";
                echo "<tr class=tans><td>True Answer<td>".$_SESSION[trueans];
                $w=$_SESSION[qn]-$_SESSION[trueans];
                echo "<tr class=fans><td>Wrong Answer<td> ". $w;
                echo "</table>";
                mysql_query("insert into mst_result(login,test_id,test_date,score) values('$login',9,'$myDate',$_SESSION[trueans])") or die(mysql_error());
                echo "<h1 align=center><a href=review.php> Review Question</a> </h1>";
                unset($_SESSION[qn]);
                unset($_SESSION[sid]);
                unset($_SESSION[tid]);
                unset($_SESSION[trueans]);
                exit;
        }
}
$rs=mysql_query("select * from mst_question where test_id=9 ORDER BY RAND() LIMIT 10",$cn) or die(mysql_error());
if($_SESSION[qn]>mysql_num_rows($rs)-1)
{
unset($_SESSION[qn]);
echo "<h1 class=head1>Some Error  Occured</h1>";
session_destroy();
echo "Please <a href=index.php> Start Again</a>";

exit;
}
mysql_data_seek($rs,$_SESSION[qn]);
$row= mysql_fetch_row($rs);
echo "<form name=myfm method=post action=quiz.php>";
echo "<table width=100%> <tr> <td width=30>&nbsp;<td> <table border=0>";
$n=$_SESSION[qn]+1;
echo "<tR><td><span class=style2>Que ".  $n .": $row[2]</style>";
echo "<tr><td class=style8><input type=radio name=ans value=1>$row[3]";
echo "<tr><td class=style8> <input type=radio name=ans value=2>$row[4]";
echo "<tr><td class=style8><input type=radio name=ans value=3>$row[5]";
echo "<tr><td class=style8><input type=radio name=ans value=4>$row[6]";

if($_SESSION[qn]<mysql_num_rows($rs)-1)
echo "<tr><td><input type=submit name=submit value='Next Question'></form>";
else
echo "<tr><td><input type=submit name=submit value='Get Result'></form>";
echo "</table></table>";
?>
</body>
</html>

Answer 1

尝试使用distinct：

$rs=mysql_query("select distinct * from mst_question where test_id=9 ORDER BY RAND() LIMIT 10",$cn)

如何从三个或四个表中获取随机问题而不重复问题

1 个答案: