sql - 数据透视表中的文本值？

Question

我有一个包含 3 列的表(在 MySQL 中):

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

现在我需要制作一个包含上述信息的矩阵，如下所示:

       Computers      Printers       Software

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

最终我需要在 Excel 中有这个。

实际上，我有可变数量的类别，因此在 MySQL 中为每列连接并不是一个好的选择。我可以用 PHP 编写一个函数，但我想知道是否有更优雅的解决方案。

我在 Excel 中查看了数据透视表，但它们似乎更适合将数字作为值。但也许我忽略了一些东西，因为我自己从不使用 Excel。

有任何想法吗？

Answer 1

我在使用数据透视表时遇到了同样的问题……非常适合摘要，但不适用于文本矩阵。

我刚刚“解除”了一些我使用的代码示例。在这里，我在 A-D 列中有数据，并在 F 列周围构建矩阵(在同一张表中)。

检查这是否有帮助。

我仍然无法让代码看起来正确，所以请注意很多代码在代码窗口之前开始。

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