php递归无限极分类 sql无限极分类，递归查询？
sql无限极分类，递归查询？with tb1(id，pid，name)as ( select id，pid，name from 表名 a where pid=0 inner join select i
sql无限极分类，递归查询？
with tb1(id，pid，name)as ( select id，pid，name from 表名 a where pid=0 inner join select id，pid，name from 表名 b on a.id=b.pid ) select * from tb1