mysql查询语法错误

Question

我想拉只有在下面的查询maxscore =分数的测验，请告诉我什么是错误的语法？

$database->setQuery('SELECT distinct qui.title AS name,' . 
     ' (SELECT GROUP_CONCAT(profiles.title) 
       FROM #__jquarks_users_profiles AS users_profiles 
       LEFT JOIN #__jquarks_profiles AS profiles ON users_profiles.profile_id = profiles.id 
       WHERE users_profiles.user_id = sessionWho.user_id) AS profile, ' . 
     ' (SELECT sum(score) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id 
       AND status <> -1) AS score,' . 
     ' (SELECT count(distinct(question_id)) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id) AS maxScore,' . 

      ' (SELECT count(id) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE status=-1 
       AND quizsession_id = quizSession.id) AS evaluate,' . 
' quizSession.finished_on,sessionWho.email' .  
     ' FROM #__jquarks_quizsession AS quizSession' . 
     ' LEFT JOIN #__jquarks_users_quizzes AS users_quizzes ON users_quizzes.id = quizSession.affected_id' . 
     ' LEFT JOIN #__jquarks_quizzes AS qui ON users_quizzes.quiz_id = qui.id' . 
     ' LEFT JOIN #__jquarks_quizzes_answersessions AS quizSessAns ON quizSessAns.quizsession_id = quizSession.id' . 
     ' LEFT JOIN #__jquarks_sessionwho AS sessionWho ON sessionWho.session_id = quizSession.id' . 
     ' LEFT JOIN #__jquarks_users_profiles AS users_profiles ON users_profiles.user_id = sessionWho.user_id' . 
' LEFT JOIN #__jquarks_profiles AS profiles ON profiles.id = users_profiles.profile_id '. 

' WHERE sessionWho.user_id =' .$id AND score = maxScore) ; 

Answer 1

$database->setQuery(
    "SELECT * 
    FROM 
    (SELECT distinct qui.title AS name, 
      (SELECT GROUP_CONCAT(profiles.title) 
       FROM #__jquarks_users_profiles AS users_profiles 
       LEFT JOIN #__jquarks_profiles AS profiles ON users_profiles.profile_id = profiles.id 
       WHERE users_profiles.user_id = sessionWho.user_id) AS profile, 
      (SELECT sum(score) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id 
       AND status <> -1) AS score, 
      (SELECT count(distinct question_id) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id) AS maxScore, 
      (SELECT count(id) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE status=-1 
       AND quizsession_id = quizSession.id) AS evaluate, 
      quizSession.finished_on, 
      sessionWho.email  
     FROM #__jquarks_quizsession AS quizSession 
     LEFT JOIN #__jquarks_users_quizzes AS users_quizzes ON users_quizzes.id = quizSession.affected_id 
     LEFT JOIN #__jquarks_quizzes AS qui ON users_quizzes.quiz_id = qui.id 
     LEFT JOIN #__jquarks_quizzes_answersessions AS quizSessAns ON quizSessAns.quizsession_id = quizSession.id 
     LEFT JOIN #__jquarks_sessionwho AS sessionWho ON sessionWho.session_id = quizSession.id 
     LEFT JOIN #__jquarks_users_profiles AS users_profiles ON users_profiles.user_id = sessionWho.user_id 
     LEFT JOIN #__jquarks_profiles AS profiles ON profiles.id = users_profiles.profile_id 
     WHERE sessionWho.user_id = " . $id . 
    ") 
    WHERE score = maxScore") ; 

Answer 2

最后一部分，AND score = maxScore不要放在引号。这也应该是你的SQL字符串的一部分。

即使在应用于问题代码的突出显示中，您也可以很容易地看到这一点，但您的编辑器的荧光笔当然也应该让它回味无穷。您是否使用NetBeans或Notepad ++等编辑器？

$database->setQuery('SELECT distinct qui.title AS name,' . 
     ' (SELECT GROUP_CONCAT(profiles.title) 
       FROM #__jquarks_users_profiles AS users_profiles 
       LEFT JOIN #__jquarks_profiles AS profiles ON users_profiles.profile_id = profiles.id 
       WHERE users_profiles.user_id = sessionWho.user_id) AS profile, ' . 
     ' (SELECT sum(score) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id 
       AND status <> -1) AS score,' . 
     ' (SELECT count(distinct(question_id)) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE quizsession_id = quizSession.id) AS maxScore,' . 

      ' (SELECT count(id) 
       FROM #__jquarks_quizzes_answersessions 
       WHERE status=-1 
       AND quizsession_id = quizSession.id) AS evaluate,' . 
' quizSession.finished_on,sessionWho.email' .  
     ' FROM #__jquarks_quizsession AS quizSession' . 
     ' LEFT JOIN #__jquarks_users_quizzes AS users_quizzes ON users_quizzes.id = quizSession.affected_id' . 
     ' LEFT JOIN #__jquarks_quizzes AS qui ON users_quizzes.quiz_id = qui.id' . 
     ' LEFT JOIN #__jquarks_quizzes_answersessions AS quizSessAns ON quizSessAns.quizsession_id = quizSession.id' . 
     ' LEFT JOIN #__jquarks_sessionwho AS sessionWho ON sessionWho.session_id = quizSession.id' . 
     ' LEFT JOIN #__jquarks_users_profiles AS users_profiles ON users_profiles.user_id = sessionWho.user_id' . 
' LEFT JOIN #__jquarks_profiles AS profiles ON profiles.id = users_profiles.profile_id '. 

' WHERE sessionWho.user_id =' .$id . ' AND score = maxScore') ; 

PS：你的表名实际上是否包含#？也许你应该使用围绕这些表名反引号，然后，像：

LEFT JOIN `#__jquarks_users_profiles`