小编Boj*_*mov的帖子

$sql = "CREATE TABLE IF NOT EXISTS questions_$username(".
        "question_id INT NOT NULL AUTO_INCREMENT, ".
        "question MEDIUMTEXT, ".
        "answer CHAR(1), ".
        "PRIMARY KEY (question_id))";
$retval = mysql_query($sql, $conn) or die(mysql_error());

$sql = "CREATE TABLE IF NOT EXISTS tests_$username(".
        "test_id INT NOT NULL AUTO_INCREMENT, ".
        "name VARCHAR(30) NOT NULL, ".
        "duration INT NOT NULL, ".
        "PRIMARY KEY (test_id))";
$retval = mysql_query($sql, $conn) or die(mysql_error());

$sql = "CREATE TABLE IF NOT EXISTS questions_tests_$username(".
        "test_id INT NOT NULL, ".
        "question_id INT NOT NULL, ". …