简而言之:有什么方法可以对GROUP_CONCAT语句中的值进行排序吗?
查询:
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
我得到这一行:
工艺品»细木工 行政管理»组织
工艺品»细木工
行政管理»组织
我想要这样:
行政管理»组织 工艺品»细木工
当然,请参见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;