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SQL JOIN NULL PROBLEM

Author

Topic

outlander
Starting Member

1 Post

Posted - 2011-03-09 : 20:29:04

there are Ogrenci,Odev,Sinav,Proje tables and also for connecting to student, Ogr_Sinav, Ogr_Proje, Ogr_Odev tables in sql database.
i wanna that sorting student names in rows, Odev, proje and Sinav in columns.This is why, I tried die to use pivot function.

My code:

DECLARE @SinavSutun VARCHAR(8000)
SELECT @SinavSutun = COALESCE(@SinavSutun + ',[' + cast(SinavAdi as varchar) + ']',
'[' + cast(SinavAdi as varchar)+ ']')
FROM Sinav GROUP BY SinavAdi

DECLARE @OdevSutun VARCHAR(8000)
SELECT @OdevSutun = COALESCE(@OdevSutun + ',[' + cast(OdevAdi as varchar) + ']',
'[' + cast(OdevAdi as varchar)+ ']')
FROM Odev GROUP BY OdevAdi

DECLARE @ProjeSutun VARCHAR(8000)
SELECT @ProjeSutun = COALESCE(@ProjeSutun + ',[' + cast(ProjeAdi as varchar) + ']',
'[' + cast(ProjeAdi as varchar)+ ']')
FROM Proje GROUP BY ProjeAdi

DECLARE @query1 VARCHAR(8000)
SET @query1 = '
Select * from (Select tablo1.OgrenciId from
(
SELECT * FROM
(
SELECT Ogr_Sinav.OgrenciId , Sinav.SinavAdi, Ogr_Sinav.Notu as notu
FROM Ogr_Sinav INNER JOIN
Ogrenci ON Ogr_Sinav.OgrenciId = Ogrenci.OgrenciId INNER JOIN
Sinav ON Ogr_Sinav.SinavId = Sinav.SinavId
) as Sinavlar
PIVOT
(
MAX(notu)
FOR [SinavAdi]
IN (' + @SinavSutun + ')
)
AS p) tablo1
inner join (
------------------------------------------------------------------------------------------------
SELECT * FROM
(
SELECT Ogr_Odev.OgrenciId, Odev.OdevAdi, Ogr_Odev.Notu
FROM Odev INNER JOIN
Ogr_Odev ON Odev.OdevId = Ogr_Odev.OdevId
) as OdevTablo
PIVOT
(
MAX(Notu)
FOR [OdevAdi]
IN (' + @OdevSutun + ')
)
AS p ) tablo2

on

tablo1.OgrenciId=tablo2.OgrenciId ) tablo3

inner join

(
SELECT * FROM
(
SELECT Ogr_Proje.OgrenciId, Proje.ProjeAdi, Ogr_Proje.Notu
FROM Ogr_Proje INNER JOIN
Proje ON Ogr_Proje.ProjeId = Proje.ProjeId
) as ProjeTablo
PIVOT
(
MAX(Notu)
FOR [ProjeAdi]
IN (' + @SinavSutun + ',' + @OdevSutun + ',' + @ProjeSutun + ')
)
AS p
) tablo4
on tablo3.OgrenciId= tablo4.OgrenciId

'

EXECUTE(@query1)

---------------------------------------------
---------------------------------------------
---------------------------------------------

when i execute this query, i get rows and columns that i need; but my problem is that, when i use inner join between table1 and table2, it just allows me
select Ogrenci_id but not select * . so Odevs and Sinavs get null.

thanks for your help

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