使SQL Server 2005中

Question

cat_id prod_name parent_cat_id 
------ ---------- ------------ 
1 prod_1  2 
2 prod_2  5 
3 prod_3  1 
4 prod_4  3 
5 prod_5  7 
6 prod_6  5 

遞歸函數在遞歸函數，做一個表，並通過使用這些，如果CAT_ID = 1和parent_cat_id = 1取該產品的名稱，如果該產品類別ID和父類的id是同樣然後採取記錄也..

ANS IS LIKE ::: 

1 prod_1  2 
2 prod_2  5 
5 prod_5  7 

Answer 1

WITH rows AS 
     (
     SELECT cat_id, prod_name, parent_cat_id 
     FROM mytable 
     WHERE cat_id = 1 
     UNION ALL 
     SELECT m.cat_id, m.prod_name, m.parent_cat_id 
     FROM mytable m 
     JOIN rows r 
     ON  r.parent_cat_id = m.cat_id 
     ) 
SELECT * 
FROM rows