GROUP_CONCAT ORDER BY

Solución:

Puedes usar ORDER BY dentro de GROUP_CONCAT funcionar de esta manera:

SELECT li.client_id, group_concat(li.percentage ORDER BY li.views ASC) AS views, 
group_concat(li.percentage ORDER BY li.percentage ASC) 
FROM li GROUP BY client_id

El group_concat admite su propia cláusula order by

MySQL – The GROUP_CONCAT() function

Entonces deberías poder escribir:

SELECT li.clientid, group_concat(li.views order by views) AS views,
group_concat(li.percentage order by percentage) 
FROM table_views GROUP BY client_id

Tratar

SELECT li.clientid, group_concat(li.views ORDER BY li.views) AS views,
       group_concat(li.percentage ORDER BY li.percentage) 
FROM table_views li 
GROUP BY client_id

http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function%5Fgroup-concat

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