Concatenate multiple rows in one field in Access? [duplicate]

Answer 1

Allen Browne provides a function which you may find useful for this: Concatenate values from related records. Save that function's code in a standard module.

SELECT DISTINCT
    [Order Number],
    ConcatRelated("[Product Types]",
        "YourTable",
        "[Order Number] = " & [Order Number],
        "[Product Types]",
        "/"
        ) AS All_Product_Types
FROM YourTable;

I tested that query in Access 2007 with your sample data saved in a table named "YourTable". It returned the results you asked for. However, this only works from within an Access session. If you wanted to run this query from outside Access (like from ASP), user-defined functions are not available, so you would get an error about ConcatRelated() not recognized.

So you can use a query to retrieve the concatenated values whenever you need them. However if you store those concatenated values, they can quickly be out of sync with changes to the base table's data.