php - mySQL如何根据匹配的列值进行查询？

Question

我希望 while 循环根据“id”的匹配列值进行输出。

    $query = "SELECT s.id,s.last,s.first,s.course1,s.course2,s.course3
            ,e.id,e.last,e.first,e.course1,e.course2,e.course3
            FROM $startsem1 s
            JOIN $endsem1 e on s.id = e.id";
    $result = mysql_query($query) or die(mysql_error());

    while ($row = mysql_fetch_assoc($result))
    {
         print_r($row); echo "<br><br>";
    }

Answer 1

使用连接:

SELECT s.id,s.last,s.first,s.course1,s.course2,s.course3
      ,e.id,e.last,e.first,e.course1,e.course2,e.course3
  FROM $startsem1 s
  JOIN $endsem1 e on s.id = e.id