Pivot Table in c#

Question

I need to create a pivot table in .net. Can't use any third party control (unless it's free). I tried to find documentation that explains how to create pivot table (algorithm or steps) in general but almost everything is related to excel. Does anyone know how to create pivot table in c#??? Thanks

Answer 1

Helping here http://msdn.microsoft.com/en-us/library/aa172756%28SQL.80%29.aspx

Actual Table:

Year   Quarter  Amount    
1990      1      1.1  
1990      2      1.2  
1990      3      1.3  
1990      4      1.4  
1991      1      2.1  
1991      2      2.2  
1991      3      2.3  
1991      4      2.4  
1992      4      2.4  

Desired Output: (Here Q for Quarter)

Year       Q-1       Q-2       Q-3       Q-4      
1990       1.1       1.2       1.3       1.4  
1991       2.1       2.2       2.3       2.4  
1992       0.0       0.0       0.0       2.4  

Query:

Use Northwind    
GO

CREATE TABLE Pivot    
( Year      SMALLINT,    
  Quarter   TINYINT,    
  Amount    DECIMAL(2,1) )    
GO

INSERT INTO Pivot VALUES (1990, 1, 1.1)    
INSERT INTO Pivot VALUES (1990, 2, 1.2)    
INSERT INTO Pivot VALUES (1990, 3, 1.3)    
INSERT INTO Pivot VALUES (1990, 4, 1.4)    
INSERT INTO Pivot VALUES (1991, 1, 2.1)    
INSERT INTO Pivot VALUES (1991, 2, 2.2)    
INSERT INTO Pivot VALUES (1991, 3, 2.3)    
INSERT INTO Pivot VALUES (1991, 4, 2.4)    
INSERT INTO Pivot VALUES (1992, 4, 2.4)   
GO

SELECT * FROM Pivot    
GO

SELECT Year,    
    SUM(CASE Quarter WHEN 1 THEN Amount ELSE 0 END) AS Q1,    
    SUM(CASE Quarter WHEN 2 THEN Amount ELSE 0 END) AS Q2,    
    SUM(CASE Quarter WHEN 3 THEN Amount ELSE 0 END) AS Q3,    
    SUM(CASE Quarter WHEN 4 THEN Amount ELSE 0 END) AS Q4    
FROM Northwind.dbo.Pivot    
GROUP BY Year    
GO

Another Output:

SELECT P1.*, (P1.Q1 + P1.Q2 + P1.Q3 + P1.Q4) AS YearTotal    
FROM (SELECT Year,
             SUM(CASE P.Quarter WHEN 1 THEN P.Amount ELSE 0 END) AS Q1,
             SUM(CASE P.Quarter WHEN 2 THEN P.Amount ELSE 0 END) AS Q2,
             SUM(CASE P.Quarter WHEN 3 THEN P.Amount ELSE 0 END) AS Q3,
             SUM(CASE P.Quarter WHEN 4 THEN P.Amount ELSE 0 END) AS Q4
     FROM Pivot AS P
     GROUP BY P.Year) AS P1
GO