[color=red][b]示例[/b][/color]
with RECURSIVE cte as
(
select a.* from tb_sm_module a where module_id=0
union all
select k.* from tb_sm_module k inner join cte c on c.module_id = k.parent_id
)select cte.* from cte;
[img]http://dl2.iteye.com/upload/attachment/0107/0746/f28bebac-0d06-3dab-996a-16243a948c2e.png[/img]
with RECURSIVE cte as
(
select a.module_id,cast(a.module_name as varchar(100)) from tb_sm_module a where module_id=0
union all
select k.module_id,cast(c.module_name||'>'||k.module_name as varchar(100)) as module_name from tb_sm_module k inner join cte c on c.module_id = k.parent_id
)select module_id,module_name from cte ;
[img]http://dl2.iteye.com/upload/attachment/0107/0748/9251909d-0fc4-368d-8b9b-3a76f71f6314.png[/img]
这里有一个疑问,文什么把后面显示的层级名称改成module_id, 但不起到效果?
[b][color=red]两个方向的例子[/color][/b]
--向下查找标签:PostgreSQL,recursive,递归,--,MODULE,cte,module,id,select From: https://blog.51cto.com/u_3871599/6138557
WITH RECURSIVE T AS(
SELECT * FROM TB_SM_MODULE T1 WHERE MODULE_ID=1 --原始信息
UNION AL]L
SELECT T2.* FROM TB_SM_MODULE T2,T --附加信息
WHERE T2.PARENT_ID = T.MODULE_ID --附加信息的父亲等原始信息
)SELECT * FROM T
--向上查找
WITH RECURSIVE T AS(
SELECT * FROM TB_SM_MODULE T1 WHERE MODULE_ID=1053 --原始信息
UNION ALL
SELECT T2.* FROM TB_SM_MODULE T2,T --附加信息
WHERE T2.MODULE_ID = T.PARENT_ID --原始信息的父亲等于附加信息
)SELECT * FROM T