MySQL：對GROUP_CONCAT值進行排序

Question

簡而言之：是否有任何方法可以對GROUP_CONCAT語句中的值進行排序？

查詢：

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 

我得到該行：

工藝品»木工

管理»組織

我希望它是這樣的：

管理»組織

工藝品»木工

Answer 1

當然，看到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; 

Answer 2

你的意思是通過訂購？

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;