erstellen Sie eine Tabelle mit eindeutigen Werten aus einer Spalte als die Spaltennamen in einem Code

Question

Ich habe eine Tabelle wie unten Abbildung mit einigen eindeutigen Werten. Ich möchte eine neue Tabelle mit einer Spalte für jeden einzelnen Wert in Spalte R erstellen, der Spaltenname würde mit S beginnen. Vielen Dank im Voraus für Ihre Hilfe. (In SQL Server oder in C# oder vb.net)

My Table:

 
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 

Neue Tabelle:

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

Answer 1

Versuchen Sie, eine Pivot-Tabelle wie folgt zu erstellen:

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

Aber Sie wollen, was ist der genaue Zweck dieser Anforderung

Beispieldaten:

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') 
; 

Script

;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