Verwijder dubbele kolommen in MySQL left join-query

Dit kan op twee manieren worden opgelost:

Alleen SQL gebruiken:

SQL Fiddle:http://www.sqlfiddle.com/#!2 /19d46/14

  SELECT case
       when c.text_choice = (select min(text_choice) from choice c2 where c2.id = q.id) then name_question
       else ""
       end as name_question,

       case
       when c.text_choice = (select min(text_choice) from choice c2 where c2.id = q.id) then text_question
       else ""
       end as  text_question,
       c.text_choice 

FROM question as q LEFT JOIN choice as c  
ON q.id = c.id
order by q.id, c.text_choice;

Resultaat:

Q1  Q1_text C1
C2
C3
Q2  Q2_text C4
C5
C6

Ook PHP gebruiken:

Bij de eerste weergave kan dit eenvoudig worden bereikt via PHP en uw resultaten ordenen op naam_vraag.

$query =    ' SELECT q.name_question, q.text_question, c.text_choice'.
                        ' FROM question as q '.
                        ' LEFT JOIN choice as c ' .
                        ' ON q.id_question = c.id_question '  order by q.name_question;

Bij het weergeven van het resultaat:

$current_nameQuestion = "";    
foreach ($db->loadObjectList() as $obj){

        if($current_nameQuestion==$obj->name_question)
        {
           echo "       ".$obj->text_choice."</br>";
        }
        else
        {
           echo $obj->name_question." ".$obj->text_question." ".$obj->text_choice."</br>";
           $current_nameQuestion = $obj->name_question;
        }       
    }

De bovenstaande PHP-code drukt alleen de 2 kolomwaarden af ​​wanneer de name_question nog niet is uitgevoerd.