How to concatenate multiple rows in Access involving a Link?

Question

I have the following problem concerning my Access Database:

I have 3 tables which are tblComponents, tblErrors, and linkComponentsErrors. This is a many to many relations

Answer 1

If you don't want to use DJoin, you can do two queries and use the ConcatRelated function by Allen Browne:

A helping query "Hilfsabfrage" that does the join with the link:

SELECT tblErrors.errName, tblErrors.errID, linkComponentsErrors.CompID FROM tblErrors INNER JOIN linkComponentsErrors ON tblErrors.errID = linkComponentsErrors.errID

And the main query:

SELECT tblComponents.compName, ConcatRelated("errName", "Hilfsabfrage", "compID = " & [compID]) FROM tblComponents

Don't do this in your main query: SELECT tblComponents.compName, ConcatRelated("errName", "Hilfsabfrage", "compID = " &[Hilfsabfrage].[compID]) FROM tblComponents . The query has do be without the [Hilfsabfrage].

You can also put more than one ConcatRelated in your query.

Answer 2

You can use my DJoin function for this:

SELECT 
    tblComponents.compname, 
    DJoin(
        "errname",
        "SELECT compID, errname 
            FROM linkComponentsErrors 
            INNER JOIN tblErrors ON linkComponentsErrors.errID = tblErrors.errID",
        "compID = " & [tblComponents].[compID] & "",
        ", ") AS errnames
FROM 
    tblComponents 
INNER JOIN 
    linkComponentsErrors ON tblComponents.compID = linkComponentsErrors.compID
GROUP BY 
    tblComponents.compname, 
    DJoin(
        "errname",
        "SELECT compID, errname 
            FROM linkComponentsErrors 
            INNER JOIN tblErrors ON linkComponentsErrors.errID = tblErrors.errID",
        "compID = " & [tblComponents].[compID] & "",
        ", "), 
    tblComponents.compID
ORDER BY 
    tblComponents.compID;

Output: