ParagGupta wrote:

Q.1 what is function of GO in SP's?

ParagGupta wrote:

Q.2 If we have to use nested queries then how far we can go

Sunday Ironfoot wrote:

I would normally use Sprocs except it seems overkill for such a simple SQL SELECT statement.

public object Save()
{
    if (_bm == null)
    {
        return DBNull.Value;
    }
    else
    {
        MemoryStream ms = new MemoryStream();
        _bm.Save(ms,_bm.RawFormat);
        byte[] buf = ms.GetBuffer();
        ms.Close();
        return buf;
    }
}

SELECT
    StudentID,
    (SELECT Score FROM StudentScores 
     WHERE StudentId = ss.StudentId AND
           Course = 'Maths') AS Maths, 
    (SELECT Score FROM StudentScores 
     WHERE StudentId = ss.StudentId AND
           Course = 'English') AS English,
    (SELECT Score FROM StudentScores 
     WHERE StudentId = ss.StudentId AND
           Course = 'Hindi') AS Hindi
FROM
    StudentScores ss
ORDER BY 
    StudentID 

(ISNULL(SELECT MAX(Score) FROM StudentScores 
        WHERE StudentId = ss.StudentId AND
        Course = 'Maths'),0) AS Maths 

CREATE PROCEDURE GetGrades AS

DECLARE @sql VARCHAR(2500), @cClass VARCHAR(10) 

SET @sql = ''

DECLARE curClasses CURSOR FOR SELECT DISTINCT class FROM tblGrades
OPEN curClasses
FETCH NEXT FROM curClasses INTO @cClass
WHILE @@FETCH_STATUS = 0
BEGIN
	SET @sql = @sql + ', (SELECT grade 
                              FROM tblGrades t2 
                              WHERE t2.StudentId = t1.StudentId 
                                    and t2.Class = ''' + @cClass + ''') as ' + @cClass
	FETCH NEXT FROM curClasses INTO @cClass
END

close  curClasses
DEALLOCATE curClasses

SET @sql =  'SELECT studentid ' + @sql + ' FROM tblGrades t1 GROUP BY studentid'
exec(@sql)
GO