ejemplos - MySQL: ordenar valores de GROUP_CONCAT

group_concat mysql separator

Question

En resumen: ¿hay alguna manera de ordenar los valores en una declaración GROUP_CONCAT?

Consulta:

GROUP_CONCAT((SELECT GROUP_CONCAT(parent.name SEPARATOR " » ") 
FROM test_competence AS node, test_competence AS parent 
WHERE node.lft BETWEEN parent.lft AND parent.rgt 
  AND node.id = l.competence 
  AND parent.id != 1 
ORDER BY parent.lft) SEPARATOR "<br />/n") AS competences

Obtengo esta fila:

Artesanía »Carpintería

Administración »Organización

Lo quiero así:

Administración »Organización

Artesanía »Carpintería

Answer 1

¿Quieres ordenar por?

SELECT _key,            
COUNT(*) as cnt,            
GROUP_CONCAT(_value ORDER BY _value SEPARATOR '', '') as value_list      
FROM group_concat_test      
GROUP BY _key      
ORDER BY _key;

Answer 2

Claro, vea http://dev.mysql.com/doc/refman/...tions.html#function_group-concat :

SELECT student_name,
  GROUP_CONCAT(DISTINCT test_score ORDER BY test_score DESC SEPARATOR '' '')
  FROM student
  GROUP BY student_name;