 NeoPa  32,556
Expert Mod 16PB
A number of posters have asked to be shown how to produce a list of items from multiple records which are (potentially) grouped together.
Take the following data for instance (from a table called [tblForum]) : - Zone Forum
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Community Introductions
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Community Community Cafe
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Community Software Development
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Community Jobs / Contract Work
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Community Experts Panel
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Programming C++ / C
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Programming Java
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Programming .NET
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Programming Visual Basic
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Programming Python
-
Web Development PHP
-
Web Development Ruby / Rails
-
Web Development Perl
-
Web Development ASP
-
Web Development ColdFusion
-
Web Development Javascript / Ajax
-
Web Development Flash
-
Web Development XML
-
Web Development WAP / WML
-
Web Development HTML / CSS
-
Database Help MySQL
-
Database Help Oracle
-
Database Help SQL Server
-
Database Help PostgreSQL
-
Database Help Access
-
Database Help DB2
-
Sys Admin & OS Apache
-
Sys Admin & OS IIS
-
Sys Admin & OS Networking
-
Sys Admin & OS Linux / Unix / BSD
-
Sys Admin & OS Windows
If you wanted this to be grouped together into lists (as below) then read on. - Zone Forums
-
Community Introductions, Community Cafe, Software Development, Jobs / Contract Work, Experts Panel
-
Programming C++ / C, Java, .NET, Visual Basic, Python
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Web Development PHP, Ruby / Rails, Perl, ASP, ColdFusion, Javascript / Ajax, Flash, XML, WAP / WML, HTML / CSS
-
Database Help MySQL, Oracle, SQL Server, PostgreSQL, Access, DB2
-
Sys Admin & OS Apache, IIS, Networking, Linux / Unix / BSD, Windows
Firstly, create a function in a standard module similar to the example code attached : - 'Concat Returns lists of items which are within a grouped field
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Public Function Concat(strGroup As String, _
-
strItem As String) As String
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Static strLastGroup As String
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Static strItems As String
-
-
If strGroup = strLastGroup Then
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strItems = strItems & ", " & strItem
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Else
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strLastGroup = strGroup
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strItems = strItem
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End If
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Concat = strItems
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End Function
The SQL for calling this function would be of the form : - SELECT [Zone],
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Max(Concat([Zone], [Forum])) AS [Forums]
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FROM [tblForum]
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GROUP BY [Zone]
Another form of this (to drop duplicates) would be : - 'Concat Returns lists of items which are within a grouped field
-
Public Function Concat(strGroup As String, _
-
strItem As String) As String
-
Static strLastGroup As String
-
Static strItems As String
-
-
If strGroup = strLastGroup Then
-
If InStr(", " & strItems & ", ", ", " & strItem & ", ") = 0 Then _
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strItems = strItems & ", " & strItem
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Else
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strLastGroup = strGroup
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strItems = strItem
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End If
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Concat = strItems
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End Function
1 8179 
This is nice.
I combined the two functions by adding a third parameter "uniq" -
'Concat Returns lists of items which are within a grouped field
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'Set uniq=-1 (True) to return only unique values.
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Public Function ConcatLine(strGroup As String, _
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strItem As String, uniq As Boolean) As String
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Static strLastGroup As String
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Static strItems As String
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Static i As Integer
-
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If strGroup = strLastGroup Then
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If uniq Then
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If InStr(", " & strItems & ", ", ", " & strItem & ", ") = 0 Then
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strItems = strItems & ", " & strItem
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End If
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Else
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strItems = strItems & ", " & strItem
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End If
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Else
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strLastGroup = strGroup
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strItems = strItem
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End If
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ConcatLine = strItems
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i = i + 1
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Debug.Print i & " "; Len(ConcatLine) & " " & ConcatLine
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End Function
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