Question

I have a table where I have menus listed where I can insert and delete.

Structure goes like:-

ID  Name                  ParentId
1  1. Home                    0
2  2. Products                0
3      a. SubProduct1         2
4      b. SubProduct2         2
5         i. Subsub           4
6         ii. ......          4
7  3. About                   0

Top-level menu ParentId is always 0 as displayed in 1, 2 and 7.

Child level items would have ParentId of their parent for ex. Subproduct has 2 as its parentId.

When I delete menu item that time all level child item should be delete irrespective of there levels using SQL query.

There can be any number of levels

The levels can go upto subsubsubsub…… any number.

Answer 1

How about this query:

DECLARE @DelID INT
SET @DelID=1

;WITH T(xParent, xChild)AS
(
SELECT ParentID, ChildId FROM Table WHERE ParentID=@DelID
UNION ALL
SELECT ParentID, ChildId FROM TABLE INNER JOIN T ON ParentID=xChild
)
DELETE FROM TABLE WHERE ParentID IN (SELECT xParent FROM T)