php - How do I Get the cummulative total of equation in MySql statement -


i have following mysql statement, cannot cummulative total 'ranking' in while loop

select *,     q1 + ((q1 + q2 + q3 + q4 + q5 + q6) / 6)     ranking     / sum(ranking)     table     field = :field     group id

this part of query works perfectly: 

q1 + ((q1 + q2 + q3 + q4 + q5 + q6) / 6)     ranking

i need divide 'as ranking' value sum of each 'ranking' row in query output , return in $rankingpercentage variable in while loop.

q1 q2 q3 q4 q5 q6 fields in 1 table , contain number values (varchar) between 0 , 100.

i expect return output $rankingpercentage 'ranking' (my equation above "as ranking") divided sum of 'ranking' rows returned in sql query.

my while loop below:

 while($row = $sqlprep->fetch(pdo::fetch_obj)){          $ranking = $row->ranking;          echo '<tr valign="bottom"><td>' . $row->id . '</td>';         echo '<td>' . $row->uid . '</td>';         echo '<td>' . $row->q1 . '</td>';         echo '<td>' . $row->q2 . '</td>';         echo '<td>' . $row->q3 . '</td>';         echo '<td>' . $row->q4 . '</td>';         echo '<td>' . $row->q5 . '</td>';         echo '<td>' . $row->q6 . '</td>';         echo '<td>' . $row->q9 . '</td>';         echo '<td class="capitalise">' .  $ranking. '</td>';         echo '<td class="capitalise">' .  $rankingpercentage . '</td>';         echo '</tr>';     }

as understand it, have formula assign score per row, , need see portion of total score across rows row earns.

a sub-select solve this, though join more efficient.

select     *,     <formula> ranking     <formula> / (         select sum(<formula>)          table         field = :field     ) rankingpercentage table field = :field group id

this tell part of whole each row owns, not tell given row in top x%.


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