How can i Select Child with Parents and Paretns Of Parents ?

Question

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Hi every one.
I have a Table, that have Parent in Same Table like this :

SQL

CREATE TABLE [dbo].[tSameCategoryProducts](
    [CategoryProductID] [int] IDENTITY(1011,3) Primary Key NOT NULL,
    [CategoryProductParentID] [int] NULL,
    [CategoryText] [nvarchar](100) NULL,

GO

ALTER TABLE [dbo].[tSameCategoryProducts]  WITH CHECK ADD FOREIGN KEY([CategoryProductParentID])
REFERENCES [dbo].[tSameCategoryProducts] ([CategoryProductID])

GO

Imagine i have a tree in this Table, for Example :

ID   ParentID   Text

1  --  null    --   Car
2  --  1       --   Sport
3  --  2       --   Lamborghini
.
.
.

Is there any way that in One Select have Something like This ? :

Text     ---      AllParents

Car      ---      Car
Sport    ---     Car/Sport
Lamborghini  ---   Car/Sport/Lamborghini
.
.
.

Thanks in Advance.

Posted 25-May-12 20:47pm

arminamini

Updated 25-May-12 21:05pm

Wendelius

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Wendelius · Accepted Answer · 2012-05-25T21:57:00

Solution 1

You can use Common Table Expression[^] to create cumulate values from previous rows.

For example something like

SQL

WITH Cars (CategoryProductID, Text, Parents)
AS (
    SELECT CategoryProductID, CategoryText, CategoryText
    FROM tSameCategoryProducts
    WHERE CategoryProductID = 1
    UNION ALL
    SELECT CategoryProductID, CategoryText, Parents + '/' + CategoryText
    FROM tSameCategoryProducts t inner join cars c
         on t.CategoryProductParentID = c.CategoryProductID
)
SELECT Text, Parents
FROM Cars

For more information see Recursive Queries Using Common Table Expressions[^]

Posted 25-May-12 21:57pm

Wendelius

Comments

arminamini 26-May-12 5:48am

Many Thanks.

Wendelius 1-Jun-12 0:30am

You're welcome :)

Monjurul Habib 26-May-12 15:49pm

5!

Wendelius 1-Jun-12 0:30am

Thanks :)

Maciej Los 29-May-12 5:00am

Good work, Mika ;)
+5!

Wendelius 1-Jun-12 0:31am

Thanks :)