Question

hi everyone im beginner in php & mysql here im joining 3 tables but my query is not running as it is not right. thres is syntax error in it. please help, i would be thankful :))

$result = mysql_query("SELECT   courses.id AS cid,
                                courses.title,
                                courses.subjectsid,
                                subjects.id AS sid,
                                subjects.subjectname,
                                requestrecord.status
                       FROM     courses,
                                subjects,
                                requestrecord
                       LEFTJOIN requestrecord
                         ON     courses.id = requestrecord.coursesid
                       WHERE   (courses.subjectsid = subjects.id )");

Answer 1

You have a strange mix of implicit (WHERE clause) and explicit joins plus the syntax error with LEFT JOIN. It is recommended to settle on explicit joins only. Ultimately, your method proces two joins against requestrecord.

SELECT
  courses.id AS cid, 
  courses.title, courses.subjectsid,  
  subjects.id AS sid, 
  subjects.subjectname, 
  requestrecord.status 
FROM 
  courses 
  /* Explicit inner join against `subjects` */
  JOIN subjects ON courses.subjectsid = subjects.id
  /* LEFT JOIN against requestrecord */
  LEFT JOIN requestrecord ON courses.id = requestrecord.coursesid