无限层级结构的table1表，Id（主键）,ParentId（父级id）查询某个Id的所有下级或所有上级，使用WITH AS，UNION ALL 查询

1、查询Id为1所有的下级

WITH TAS(     SELECT * FROM table1 WHERE Id=1    UNION ALL     SELECT a.*  FROM table1 a INNER JOIN T ON a.ParentId=T.Id  ) SELECT * FROM T

2、查询Id为88所有的上级

WITH TAS(     SELECT * FROM table1 WHERE Id=88    UNION ALL     SELECT a.*      FROM table1 a INNER JOIN T ON a.Id=T.ParentId  ) SELECT * FROM T