SQL的遞歸查詢多級菜單

with tmpTable
as
(
-- 1、根節點
select * from tableName where parentId = 'xxx'
union all
-- 2、遞歸條件
select a.* from tableName a inner join tmpTable b on a.parentId = b.id
)
select * from tmpTable;

 

參考：https://blog.csdn.net/shijie_nihao/article/details/100717147

 

上面是向下查詢的，下面的是向上查詢的，其實代碼是一樣的，只是把 a.id= b.parentId 換一下

with tmpTable
as
(
-- 1、根節點
select * from tableName where parentId = 'xxx'
union all
-- 2、遞歸條件
select a.* from tableName a inner join tmpTable b on a.id= b.parentId 
)
select * from tmpTable;