Question

sql query for self join table

Asked by: ctrlctrl

Hi , I have a self join table
which 3 important columns
menuID, parentMenuID, menuName, menuDesription and other trivial fields
menuID, parentMenuID, menuName form the most important part of this .

menuID and parentMenuID are related


example entries

1, null, superParent
11, 1, firstparent
12, 1, secondParent
13, 1, thirdparent
111, 11, parent111
121, 12, parent121


so on , the list can be endless as the user has the freedom of increasing the tree horizontally and vertically upto any extent.


assume i would like  to get all the menus under 11,  as i said the menus can be increasd by the user vertically or horizontally as much as possible

please let me know how to write  a sql query for this , also if you can write a LINQ query for this that will be great

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Asked On
2009-03-28 at 07:36:12ID24273739
Topics

PL / SQL

,

Language Integrated Query - LINQ

,

SQL Server 2005

Participating Experts
2
Points
500
Comments
17

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Answers

 

by: TextReportPosted on 2009-03-28 at 08:45:52ID: 24008885

Is this Oracle's PL/SQL or Microsoft Transact SQL that you want a solution

In Oracle you can use the CONNECTBY PRIOR
http://www.oracle.com/technology/products/oracle9i/daily/oct04.html

 

by: ctrlctrlPosted on 2009-03-28 at 09:14:03ID: 24008979

Hi , I am using Microsoft SQL Server , T-SQL please

Thank You

 

by: TextReportPosted on 2009-03-28 at 09:16:30ID: 24008993

I beleive you need to take a look at http://msdn.microsoft.com/en-us/library/ms186243.aspx
Cheers, Andrew

 

by: ctrlctrlPosted on 2009-03-28 at 09:25:33ID: 24009033

Thats Text report , ill try and let you know how it works

 

by: Sharath_123Posted on 2009-03-28 at 11:02:44ID: 24009465

What is your SQL Server verion? If it is 2005 or 2008, then this will work for you.

DECLARE @ParentMenuID int
SET @ParentMenuID = 1 --replace this value with whatever the parentMenuID you want.
 ;WITH CTE AS(
SELECT MenuID, ParentMenuID,MenuName
  FROM YourTable
 WHERE ParentMenuID = @ParentMenuID
 UNION ALL
SELECT c.MenuID, c.ParentMenuID,c.MenuName
  FROM YourTable c
  JOIN CTE p
    ON c.ParentMenuID = p.MenuID
)
SELECT * FROM CTE 

                                              
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by: ctrlctrlPosted on 2009-03-28 at 11:20:59ID: 24009530

Sharat it is sql server 2005, One more question , Do you have an idea of writing this in LINQ? Thats really what I want to do..

I thought , If no one can get this in LINQ , I will pass the SQL query via code instead of using LINQ objects

Meanwhile I will try on SQL Server 2005 and let you know how it works

I need to do this via code , Please help

 

by: Sharath_123Posted on 2009-03-28 at 11:27:10ID: 24009552

I don't know LINQ. sorry for that.

The given query will work in 2005. keep the question open for LINQ experts to comment on this.

 

by: ctrlctrlPosted on 2009-03-28 at 12:23:32ID: 24009775

sharat thank you, I iwll keep this post open to see if anyone can comment in linq

 

by: ctrlctrlPosted on 2009-03-28 at 13:18:34ID: 24009986

sharat , as you said it works fine on sql server 2005

 

by: ctrlctrlPosted on 2009-03-28 at 13:19:00ID: 24009988

Pleas dont mind, I will accept the solution once I get the LINQ query

 

by: ctrlctrlPosted on 2009-03-28 at 13:28:11ID: 24010039

sharat, The query works fine , I will take your sql query and post it in LINQ section to see if I get any answers

 

by: Sharath_123Posted on 2009-03-28 at 14:19:38ID: 24010236

No issues.

 

by: ctrlctrlPosted on 2009-03-29 at 10:34:09ID: 24013590

Hi Sharat, In the same way , can you help me write a query to get all child elements under the super parent

where the child element has no more chilren, like they  are the last kids?

PLease let me know

 

by: Sharath_123Posted on 2009-03-29 at 11:17:30ID: 24013814

try this.

DECLARE @ParentMenuID int
SET @ParentMenuID = 1 --replace this value with whatever the parentMenuID you want.
 ;WITH CTE AS(
SELECT MenuID, ParentMenuID,MenuName
  FROM YourTable
 WHERE ParentMenuID = @ParentMenuID
 UNION ALL
SELECT c.MenuID, c.ParentMenuID,c.MenuName
  FROM YourTable c
  JOIN CTE p
    ON c.ParentMenuID = p.MenuID
)
SELECT C1.* 
  FROM CTE C1 
  LEFT JOIN CTE C2 
    ON C1.MenuID = C2.ParentMenuID 
 WHERE C2.MenuID IS NULL

                                              
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by: TextReportPosted on 2009-03-29 at 11:51:28ID: 24013952

Dear ctrlctrl, the use of the Common Table Expressions as described in the link I provided earlier will return ALL iterations through your records. In the code below I have assumed the table name of tblMenu and the top level is identified as =0, this may need to be changed to IS NULL.
Cheers, Andrew

USE EETest;
GO
WITH M (MenuID, ParentMenuID, MenuName, Level)
AS
(
-- Anchor member definition
    SELECT MenuID, ParentMenuID, MenuName, 0 AS Level
    FROM tblMenu
    WHERE ParentMenuID IS NULL
    UNION ALL
-- Recursive member definition
    SELECT T.MenuID, T.ParentMenuID, T.MenuName, M.Level + 1
    FROM tblMenu T
    INNER JOIN M ON T.ParentMenuID = M.MenuID
)
-- Statement that executes the CTE
SELECT MenuID, ParentMenuID, MenuName, Level
FROM M
ORDER BY MenuID 
       , MenuName
GO

                                              
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by: TextReportPosted on 2009-03-29 at 11:57:40ID: 24013984

"and the top level is identified as =0, this may need to be changed to IS NULL" sorry I changed the TOP Level identified to IS NULL already.
Cheers, Andrew

 

by: ctrlctrlPosted on 2009-03-30 at 08:30:33ID: 24019934

Sharat , Your query works perfect..
Textreport gimme few mins , I am testing your query

20120131-EE-VQP-002

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