Selecting data from multiple rows

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Selecting data from multiple rows

Author

Topic

Apples
Posting Yak Master

146 Posts

Posted - 2008-01-22 : 17:09:53

Here's my tables:

Students
-----------------------
StudentID | StudentName
-----------------------

StudentClasses
-----------------------
StudentID | ClassName
-----------------------

I'm trying to put data into a gridview in ASP.NET 2.0 like this:

Student | Classes
-----------------
Name1 | ClassName1 ClassName2 ClassName3
Name2 | ClassName1
Name3 | ClassName1 ClassName2

I just need to retrieve names of each class that a student is taking, then print them out one after another.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-01-22 : 23:03:46

[code]DECLARE @Student table
(ID int IDENTITY(1,1),
StudName varchar(50)
)

DECLARE @StudentClass table
(ID int,
ClassName varchar(50)
)

INSERT INTO @Student values('S1')

INSERT INTO @Student values('S2')

INSERT INTO @Student values('S3')

INSERT INTO @StudentClass values(1,'C1')
INSERT INTO @StudentClass values(2,'C1')
INSERT INTO @StudentClass values(1,'C2')
INSERT INTO @StudentClass values(2,'C2')
INSERT INTO @StudentClass values(3,'C1')
INSERT INTO @StudentClass values(2,'C3')
INSERT INTO @StudentClass values(2,'C3')
INSERT INTO @StudentClass values(2,'C4')
INSERT INTO @StudentClass values(1,'C3')
INSERT INTO @StudentClass values(2,'C5')
INSERT INTO @StudentClass values(3,'C2')

SELECT s.ID,cl.classlist
FROM @Student s
CROSS APPLY (SELECT ClassName as [data()]
FROM @StudentClass
WHERE ID=s.ID
FOR XML PATH(''))cl(classlist)

output
----------------------
ID classlist
----------- ---------------------------------------------------------
1 C1 C2 C3
2 C1 C2 C3 C3 C4 C5
3 C1 C2[/code]

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