数据透视表中的文本值？

Question

我有3列的表（在MySQL）：

Location Category  Supplier 

    A  Computers Company X 
    A  Printers  Company Y 
    B  Computers Company X 
    B  Printers  Company Y 
    B  Software  Company Y 
    C  Computers Company Y 
    C  Software  Company Z 

现在我需要使含有上述信息的矩阵，如下所示：

 Computers  Printers  Software 

A  Company X  Company Y 
B  Company X  Company Y  Company Y 
C  Company Y      Company Z 

最终我需要有这Excel中。

实际上，我有一个可变数量的类别，所以在MySQL中使用每个列的连接来做它并不是一个好的选择。我可以用PHP写一个函数，但我想知道是否有更优雅的解决方案。

我在Excel中查看数据透视表，但它们似乎更适合作为数值的数字。但也许我忽略了一些东西，因为我从来没有用Excel自己工作。

任何想法的？

Answer 1

我也没有办法检查查询是好的，但或多或​​少会是这样的查询：

SELECT t1.Location, MAX(t1.Computers), MAX(t1.Printers), MAX(t1.Software) 

FROM (
SELECT 
t.Location, 
CASE WHEN t.Category = 'Computers' THEN 
    t.Supplier 
END Computers, 

CASE WHEN t.Category = 'Printers' THEN 
    t.Supplier 
END Printers, 

CASE WHEN t.Category = 'Software' THEN 
    t.Supplier 
END Software, 
FROM 
YOUR_TABLE t 
) t1 
GROUP BY t1.Location 

Answer 2

我遇到了同样的问题，使用数据透视表...完美的总结，但不适用于文本矩阵。

我刚刚“举起”了一些我使用过的代码示例。在这里，我有列A-D中的数据，并在列F周围构建矩阵（在同一张表中）。

检查是否有帮助。

我仍然无法让代码看起来正确，所以请注意，代码窗口之前有很多代码开始。

代码示例1：

'Fill in the values 

Sheets("TempFile").Select 

ListRow = 1 

MisMatchCounter = 0 

Do Until Cells(ListRow, 1).Value = "" 

    ' Get table entry from third column of list. 

    TableEntry = Cells(ListRow, 3).Value 

    On Error Resume Next 

    If Err.Number > 0 Then MsgBox Err.Number 

    ' Get position of product name within range of row titles. 

    If TableEntry <> "" Then 

     TableRow = Application.Match(Cells(ListRow, 1), Range("F3:" & MYLastRowAddress), 0) ' 2 rows less than reality 

     ' Get position of product size within range of column titles. 

     TableColumn = Application.Match(Cells(ListRow, 2), Range("G2:" & MYLastColAddress), 0) 

     Set CellToFill = Range("F2").Offset(TableRow, TableColumn) 

     ' If there's already an entry in the cell, separate it from the new entry with a comma and space. 

     If Err.Number = 0 Then 

      If CellToFill.Value <> "" Then 

       CellToFill.Value = CellToFill.Value & "," 

       CellToFill.Value = CellToFill.Value & TableEntry 

      Else 

       CellToFill.Value = TableEntry 

      End If 

     Else 

      MisMatchCounter = MisMatchCounter + 1 

      Sheets("Errors").Cells(MisMatchCounter, 1).Value = ListRow 

      Sheets("Errors").Cells(MisMatchCounter, 2).Value = Cells(ListRow, 1) 

      Sheets("Errors").Cells(MisMatchCounter, 3).Value = Cells(ListRow, 2) 

      Sheets("Errors").Cells(MisMatchCounter, 4).Value = Cells(ListRow, 3) 

      Sheets("Errors").Cells(MisMatchCounter, 5).Value = Cells(ListRow, 4) 

     End If 

    End If 

    On Error GoTo 0 

    ListRow = ListRow + 1 

Loop 

代码示例2：

Sub CreateManualMatrix() 

    Dim TableRow, TableColumn As Integer 

    Dim TableEntry As String 

    Dim CellToFill As Range 

    'Sheet is called Lijst 

    'Column A is names for top row 

    'Column B is names for left column 

    'Column C is value for Matrix 



    'Matrix Top Row starts at H1 

    'Matrix Left Column starts at G2 



    MatrixLastColAddress = Range("H1").End(xlToRight).Address 

    MatrixLastRow = Range("G65536").End(xlUp).Row 

    LijstReadColumn = 3 

    LijstCurrentRow = 2 'make 1 if no header is used 

    Do Until Sheets("Lijst").Cells(LijstCurrentRow, 1).Value = "" 

     ' Get table entry from third column of list. 

     TableEntry = Sheets("Lijst").Cells(LijstCurrentRow, LijstReadColumn).Value 

     ' Get position of Employee name within Matrix. 

     TableColumn = Application.Match(Sheets("Lijst").Cells(LijstCurrentRow, 1), Range("H1:" & MatrixLastColAddress), 0) 

     ' Get position of Qualification Name within Matrix titles. 

     TableRow = Application.Match(Sheets("Lijst").Cells(LijstCurrentRow, 2), Range("G2:G" & MatrixLastRow), 0) 

     Set CellToFill = Range("G1").Offset(TableRow, TableColumn) 

     ' If there's already an entry in the cell, separate it from the new entry with a comma and space. 

     If CellToFill.Value <> "" Then CellToFill.Value = CellToFill.Value & "," 

     ' Add the new entry to the cell. 

     CellToFill.Value = CellToFill.Value & TableEntry 

     LijstCurrentRow = LijstCurrentRow + 1 

    Loop 

End Sub 

Answer 3

你追求的是什么通常被称为交叉表。这可以静态地完成像这样：

Select Location 
    , Min(Case When Category = 'Computers' Then Supplier End) As Computers 
    , Min(Case When Category = 'Printers' Then Supplier End) As Printers 
    , Min(Case When Category = 'Software' Then Supplier End) As Software 
From MyTable 
Group By Location 

但是，如果你追求的是有类别（因而列）的动态数量，这不能在SQL本机完成。这个后来的解决方案称为动态交叉表。最好的方法是在中间层构建类似于以上静态版本的SQL语句，或者使用报告工具来执行相同的操作。