使用 SQL Server 2008 R2 的矩阵结果

Question

我有一张如下图的表格：

示例：

CREATE TABLE matrix
(
  a VARCHAR(10),
  b VARCHAR(10)
);

INSERT INTO matrix VALUES('A','H')
INSERT INTO matrix VALUES('B','I')
INSERT INTO matrix VALUES('C','J')
INSERT INTO matrix VALUES('D','K')
INSERT INTO matrix VALUES('E','L')
INSERT INTO matrix VALUES('F','M')
INSERT INTO matrix VALUES('G','N')
INSERT INTO matrix VALUES('A','M')

SELECT * FROM matrix;

看起来像：

a    b
-------
A    H
B    I
C    J
D    K
E    L
F    M
G    N
A    M

现在我想以以下矩阵格式显示结果：

预期结果：

     H    I    J    K    L    M    N
 --------------------------------------
 A | 1    0    0    0    0    1    0
   | 
 B | 0    1    0    0    0    0    0
   |
 C | 0    0    1    0    0    0    0
   |
 D | 0    0    0    1    0    0    0
   |
 E | 0    0    0    0    1    0    0
   |
 F | 0    0    0    0    0    1    0
   |
 G | 0    0    0    0    0    0    1

Answer 1

DECLARE @DynamicPivotQuery AS NVARCHAR(max)   
DECLARE @ColumnName AS NVARCHAR(max)   
DECLARE @ColumnName1 AS NVARCHAR(max) 

SELECT  @ColumnName = Isnull(@ColumnName+',', '') + b,         
        @ColumnName1 = Isnull(@ColumnName1+',', '') + 'isnull(' + b + ',0)' + ' as ' + b  
FROM   (    SELECT DISTINCT b   FROM   matrix)  AS   qry1

--Select @ColumnName,@ColumnName1  
SET @DynamicPivotQuery =      
' Select ' + @ColumnName1 + '    
from  (Select *,1 ''VALUE''  from matrix ) as t pivot  ( Sum(VALUE ) for b in (' +  @ColumnName      + '))   
as pvt ' 

--print @DynamicPivotQuery  
EXEC Sp_executesql  @DynamicPivotQuery