No in not working in SQL Query

Question

Hii all ,
I have one query 
Select  FILE_ID,SCHEME_NAME FROM dbo.FILE_MASTER
INNER JOIN  dbo.SCHEME_MASTER ON dbo.FILE_MASTER.SCHEME_ID = dbo.SCHEME_MASTER.SCHEME_ID
WHERE dbo.FILE_MASTER.DEPARTMENT_ID=3
this returns 
FILE_ID SCHEME_NAME
897 5
898 10
899 5
900 10
901 5
902 10
903 5
904 10
905 5%
906 10%
.. Scheme_name is nvarchar field..
now as per my requirement i want to return the rows from scheme_master where scheme_name not matches with the result of above query 
.. sub query is 
SELECT SCHEME_NAME FROM  dbo.SCHEME_MASTER WHERE DEPARTMENT_ID=3 AND SCHEME_NAME IS NOT NULL
this returns ..
SCHEME_NAME
5
10
6
4
15
2
not a single null value returning by sub query ..
Now,
Select  FILE_ID,SCHEME_NAME FROM dbo.FILE_MASTER
INNER JOIN  dbo.SCHEME_MASTER ON dbo.FILE_MASTER.SCHEME_ID = dbo.SCHEME_MASTER.SCHEME_ID
WHERE dbo.FILE_MASTER.DEPARTMENT_ID=3
AND SCHEME_NAME IN 
(SELECT SCHEME_NAME FROM  dbo.SCHEME_MASTER WHERE DEPARTMENT_ID=3 AND SCHEME_NAME IS NOT NULL)
gives the same result as first query 
FILE_ID
SCHEME_NAME
897
5
898
10
899
5
900
10
901
5
902
10
903
5
904
10
905
5%
906
10%
now when i specify Not in query returns nothing ..
why not it is returning non -matching schemes ??
please clear .. i have also tried left join where approach ..
Dilip Patil..

Answer 1

Thanks visakh ..
same result which i have with In and Not in ..
here exist returns the matching but not exist returns nothing ..
Dilip Patil..
Did you try it correctly? Visakh's solution will work.
Check the below, If you are looking for something else, please elaborate.
create Table SCHEME_MASTER(SCHEME_ID int, SCHEME_NAME nvarchar(100), DEPARTMENT_ID int)
create Table FILE_MASTER(FILEE_ID int,SCHEME_ID int, DEPARTMENT_ID int)
Insert into SCHEME_MASTER Values(500,5,3),(500,NULL,3),(600,6,3)
Insert into FILE_MASTER Values(5000,500,3),(5001,500,3),(6001,600,3)
Select FILEE_ID,SCHEME_NAME FROM dbo.FILE_MASTER
INNER JOIN dbo.SCHEME_MASTER A1 ON dbo.FILE_MASTER.SCHEME_ID = A1.SCHEME_ID
WHERE dbo.FILE_MASTER.DEPARTMENT_ID=3
AND not exists
(SELECT 1 FROM dbo.SCHEME_MASTER A WHERE DEPARTMENT_ID=3 AND SCHEME_NAME IS NOT NULL and A.SCHEME_NAME = A1.SCHEME_NAME)
Drop table SCHEME_MASTER,FILE_MASTER
Please mark this reply as answer if it solved your issue or vote as helpful if it helped.
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