SQL SELECT中的结果太多

Question

Here is my SQL Statement...

SELECT     
    dbo.PPMASTER.Per_or_Bus, 
    dbo.PPMASTER.Assessment_Date, 
    dbo.PPBUSMST.Assessment_Number, 
    dbo.PPBUSMST.Year
FROM dbo.PPBUSMST INNER JOIN dbo.PPMASTER 
                  ON dbo.PPBUSMST.Assessment_Number = dbo.PPMASTER.Assessment_Number
WHERE (dbo.PPBUSMST.Assessment_Number = @Assessment)

The problem is that I get duplicate results stemming from the Assessment_Date . Each Assessment_Date should only have one result per Year. Any ideas?

Here is some of the results sample data...

**B 1996-05-29 00:00:00 9005450 1996**
B   1996-05-29 00:00:00 9005450 1997
B   1996-05-29 00:00:00 9005450 1998
B   1996-05-29 00:00:00 9005450 1999
B   1996-05-29 00:00:00 9005450 2000
B   1996-05-29 00:00:00 9005450 2001
B   1996-05-29 00:00:00 9005450 2002
B   1997-05-29 00:00:00 9005450 1996
**B 1997-05-29 00:00:00 9005450 1997**
B   1997-05-29 00:00:00 9005450 1998
B   1997-05-29 00:00:00 9005450 1999
B   1997-05-29 00:00:00 9005450 2000
B   1997-05-29 00:00:00 9005450 2001
B   1997-05-29 00:00:00 9005450 2002
B   1998-04-27 00:00:00 9005450 1996
B   1998-04-27 00:00:00 9005450 1997
**B 1998-04-27 00:00:00 9005450 1998**
B   1998-04-27 00:00:00 9005450 1999
B   1998-04-27 00:00:00 9005450 2000
B   1998-04-27 00:00:00 9005450 2001
B   1998-04-27 00:00:00 9005450 2002

The ones I have **'d are the results I actually want to achieve

Answer 1

Looking at what you've marked as wanting to achieve, it implies that your join conditions are incomplete. The rows you want are not only the ones where PPBUSMST.Assessment_Number = PPMASTER.Assessment_Number , but also where YEAR(PPMASTER.Assessment_Date) = PPBUSMST.[Year] .

Adding that to your join conditions should resolve the problem.