all possible combinations - ms-access

Question

i need to get a list of all possible combinations, not permutations.
to make sure i have the right name, 123 and 321 to me are the same thing and should only be listed once.
the code below does what i need but i can't convert it into MS Access vba.
i'm sorry, i know this is basic and it has been asked a million times but i can't find anything for MS Access that works for me.
Sub test_print_nCr()
print_nCr 7, 3, Range("A1")
End Sub
2.
Public Function print_nCr(n As Integer, r As Integer, p As Range)
c = 1
internal_print_nCr n, r, p, 1, 1
End Function
3.
Public Function internal_print_nCr(n As Integer, r As Integer, ByVal p As Range, Optional i As Integer, Optional l As Integer) As Integer
' n is the number of items we are choosing from
' r is the number of items to choose
' p is the upper corner of the output range
' i is the minimum item we are allowed to pick
' l is how many levels we are in to the choosing
' c is the complete set we are working on
If n < 1 Or r > n Or r < 0 Then Err.Raise 1
If i < 1 Then i = 1
If l < 1 Then l = 1
If c < 1 Then c = 1
If r = 0 Then
p = 1
Exit Function
End If
Dim x As Integer
Dim y As Integer
For x = i To n - r + 1
If r = 1 Then
If c > 1 Then
For y = 0 To l - 2
If p.Offset(c - 1, y) = "" Then p.Offset(c - 1, y) = p.Offset(c - 2, y)
Next
End If
p.Offset(c - 1, l - 1) = x
c = c + 1
Else
p.Offset(c - 1, l - 1) = x
internal_print_nCr n, r - 1, p, x + 1, l + 1
End If
Next
End Function
thank you again

Answer 1

I am not sure if this is the best method to do this, but I would use a kind of binary representation. For instance, consider the word "boy" with the number of letters n=3. This word has three letters, so you can use something like this:
001 = y,
010 = o,
011 = oy,
100 = b,
101 = by,
110 = bo,
111 = boy.
The left side can be done with a loop from i=1 to power(2,n)-1 and transforming i to a number in the binary basis. So, the only thing you have to do is to use the non null positions to build your combinations.
Probably there is something more interesting than this in Knuth.

Answer 2

i found this code here, and it gives me exactly what i need. you just have to create a table with numbers from 1-100. instructions at the link below
enter link description here
thank you everyone
Public Sub buildquery(strN As String, K As Integer)
Dim qd As DAO.QueryDef
Dim intI As Integer
Dim strsql As String
Dim strSelect As String
Dim strFrom As String
Dim strWhere As String
Set qd = CurrentDb.QueryDefs("QN")
qd.sql = "SELECT N FROM tblN WHERE N IN (" & strN & ")"
Set qd = Nothing
strSelect = "SELECT QN.N "
strFrom = "FROM QN "
strWhere = "WHERE QN_1.N > QN.N "
For intI = 1 To K - 1
strSelect = strSelect & ", QN_" & intI & ".N AS N" & intI & " "
strFrom = strFrom & ", QN AS QN_" & intI & " "
If intI < K - 1 Then
strWhere = strWhere & " AND QN_" & intI + 1 & ".N > QN_" & intI & ".N "
End If
Next
strsql = strSelect & " INTO tblCombinations " & strFrom & strWhere
DoCmd.SetWarnings False
DoCmd.RunSQL strsql
DoCmd.SetWarnings True
End Sub
then test
Public Sub testbuildquery()
buildquery "1,2,3,4,5,6,7", 3
End Sub