MySQL：排序 GROUP_CONCAT 值
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MySQL: Sort GROUP_CONCAT values
提问by Ivar
In short: Is there any way to sort the values in a GROUP_CONCAT statement?
简而言之：有没有办法对 GROUP_CONCAT 语句中的值进行排序？
Query:
询问：
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
I get this row:
我得到这一行：
Crafts » Joinery
Administration » Organization
工艺品 » 细木工
管理 » 组织
I want it like this:
我想要这样：
Administration » Organization
Crafts » Joinery
管理 » 组织
工艺品 » 细木工
回答by Sampson
Sure, see http://dev.mysql.com/doc/refman/...tions.html#function_group-concat:
当然，请参阅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;
回答by Haim Evgi
Do you mean to order by?
你的意思是订购吗？
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;
