SQL表：
user=ID、姓名、电子邮件
hero=ID，名称，等级
owner=userid，英勇的
我有两个问题：
$result = mysql_query("SELECT heroid FROM owner WHERE userid='$id'");
$heroid=mysql_fetch_row($result);
$result2 = mysql_query("SELECT name FROM hero WHERE ID = 'heroid[0]'");
$heroname = mysql_fetch_row($result2);
echo "User $id has a character named $heroname[0]";
$heroname = mysql_fetch_row($result2);
echo "User $id has a character named $heroname[0]";
..
这可以用一个查询完成吗？
是。你可以做：
SELECT h.name
FROM hero h
INNER JOIN owner o ON o.heroid = h.id
WHERE o.userid = $id