使用列中的不同值作为代码中的列名创建表格

Question

我有一个类似下图的表格，其中包含一些不同的值。我想为R列中的每个不同值创建一个包含列的新表，列名将以S开头。在此先感谢您的帮助。 （在SQL Server或C＃或vb.net）

我的表：

 
Name Family R C D 
--------------------- 
N1 F1  S1 1 A 
N2 F2  S2 2 A 
N3 F3  S1 1 B 
N4 F4  S2 2 B 
N5 F5  S3 3 A 

新表：

 
    S1 S2 S3 ....... 
--------------------------------- 
A N1 N2 N5 ....... 
    F1 F2 F5 ....... 
---------------------------------- 
B N3 N4 
    F3 F4 

Answer 1

尝试创建一个数据透视表是这样的：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Data; 

namespace ConsoleApplication1 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 

      DataTable dt = new DataTable(); 

      dt.Columns.Add("Name", typeof(string)); 
      dt.Columns.Add("Family", typeof(string)); 
      dt.Columns.Add("R", typeof(string)); 
      dt.Columns.Add("C", typeof(int)); 
      dt.Columns.Add("D", typeof(string)); 

      dt.Rows.Add(new object[] {"N1","F1","S1", 1, "A"}); 
      dt.Rows.Add(new object[] {"N2","F2","S2", 2, "A"}); 
      dt.Rows.Add(new object[] {"N3","F3","S1", 1, "B"}); 
      dt.Rows.Add(new object[] {"N4","F4","S2", 2, "B"}); 
      dt.Rows.Add(new object[] {"N5","F5","S3", 3, "A"}); 

      string[] uniqueRs = dt.AsEnumerable().Select(x => x.Field<string>("R")).Distinct().OrderBy(x => x).ToArray(); 

      DataTable pivot = new DataTable(); 
      pivot.Columns.Add("D", typeof(string)); 
      foreach (string uniqueR in uniqueRs) 
      { 
       pivot.Columns.Add(uniqueR, typeof(string)); 
      } 

      var groups = dt.AsEnumerable().GroupBy(x => x.Field<string>("D")); 

      foreach (var group in groups) 
      { 
       List<string> names = group.OrderBy(x => x.Field<int>("C")).Select(x => x.Field<string>("Name")).ToList(); 
       names.Insert(0, group.Key); 
       pivot.Rows.Add(names.ToArray()); 

       List<string> families = group.OrderBy(x => x.Field<int>("C")).Select(x => x.Field<string>("Family")).ToList(); 
       families.Insert(0, group.Key); 
       pivot.Rows.Add(families.ToArray()); 
      } 

     } 
    } 
} 

Answer 2

但是你要的是这个要求的确切目的

示例数据：

DECLARE @Table1 TABLE 
    (Name varchar(2), Family varchar(2), R varchar(2), C int, D varchar(1)) 
; 

INSERT INTO @Table1 
    (Name, Family, R, C, D) 
VALUES 
    ('N1', 'F1', 'S1', 1, 'A'), 
    ('N2', 'F2', 'S2', 2, 'A'), 
    ('N3', 'F3', 'S1', 1, 'B'), 
    ('N4', 'F4', 'S2', 2, 'B'), 
    ('N5', 'F5', 'S3', 3, 'A') 
; 

脚本

;with CTE as (
SELECT D, 
[S1], 
[S2], 
[S3] 
     FROM (
select Name, 
     Family, 
     R, 
     C, 
     D 
      FROM @Table1)t 
       PIVOT (MAX(Name) For R in ([S1],[S2],[S3]) 
)pvt 
       GROUP BY D,[S1],[S2],[S3]) 
, 
CTE2 AS (

SELECT D, 
     [S1], 
     [S2], 
     [S3] 
     FROM (
select Name, 
     Family, 
     R, 
     C, 
     D FROM @Table1)t 
      PIVOT (MAX(Family) For r in ([S1],[S2],[S3]) 
)pvt 
GROUP BY D,[S1],[S2],[S3]) 

Select 
    CASE WHEN RN = 1 THEN D ELSE NULL END NAME ,S1,S2,S3 FROM (
Select *, 
     Row_number()OVER(PARTITION BY D ORDER BY (SELECT NULL))RN from (
      SELECT D, 
      (SELECT S1 FROM cte where S1 IS NOT NULL AND C.D = D)S1, 
      (SELECT S2 FROM cte where S2 IS NOT NULL AND C.D = D)S2, 
      (SELECT S3 FROM cte where S3 IS NOT NULL AND C.D = D)S3 FROM CTE C 
      UNION 
      SELECT D, 
      (SELECT S1 FROM CTE2 where S1 IS NOT NULL AND C.D = D)S1, 
      (SELECT S2 FROM CTE2 where S2 IS NOT NULL AND C.D = D)S2, 
      (SELECT S3 FROM CTE2 where S3 IS NOT NULL AND C.D = D)S2 FROM cte2 C)T)TT