表结构
子节点拼接父节点希望得到结果:
sql 语句:
SELECT b1.id AS 'ID', IF( b1.detail_index = '', CONCAT(b2.detail_index, '_', '子类'), IF( b1.parent_id = 0, b1.detail_index, CONCAT(b2.detail_index, '_', b1.detail_index) ) ) AS '索引', b1.detail_label AS '条目名称', IFNULL(b1.detail_note, '') AS '条目备注' FROM system_dictionary_details_copy AS b1 LEFT JOIN system_dictionary_details_copy AS b2 ON b1.parent_id = b2.id WHERE 1 = 1