数据库树形结构查询语句

表：

数据：

查询方法：

WITH Tree AS (
    SELECT * FROM TableT AS tt WHERE tt.ID=8
    UNION ALL
    SELECT tt.* FROM Tree AS t INNER JOIN TableT AS tt ON t.ID = tt.pCatID 
)

SELECT * FROM Tree AS t

查出父ID为8的所有节点下的数据