如何使用SQL得到第三個表列

Question

$sql = "SELECT m.*,p.place_title 
       FROM members_meetings mm,meetings m,places p 
       WHERE mm.meeting_id=m.meeting_id AND mm.member_id=$member_id AND m.cat_id=$cat_id AND m.place_id=p.place_id AND m.meeting_status<>0 
       ORDER BY mm.meeting_id DESC"; 

---

我有一個包含另一個表meeting_time_poll這些列：

poll_id 
meeting_id 
poll_closed 
poll_dates 
poll_times 

我需要poll_id其中meeting_time_poll.meeting_id = meeting.meeting_id 哪有我把它放在SQL？

注：沒有從表中所有的會議都MEETING_ID一個在meeting_time調查

Answer 1

這樣如何對應？

$sql = "SELECT m.*,p.place_title, mp.poll_id 
      FROM 
       members_meetings mm, 
       meetings m,places p, 
       meeting_time_poll mp 
      WHERE 
       mm.meeting_id=m.meeting_id 
       AND mm.member_id=$member_id 
       AND m.cat_id=$cat_id 
       AND m.place_id=p.place_id 
       AND m.meeting_status<>0 
       AND mp.meeting_id=m.meeting_id 
      ORDER BY mm.meeting_id DESC"; 

另外我會建議使用JOIN。