MS Access - Aggregate functions and max - ms-access

Question

I have this query, where I am trying to get max age of a retail store seller(There's multiple towns), and show multiple if there's multiple people with the same (max)age. I am using Microsoft Access 2010. Here is the query:
SELECT Linnad.Linn, Myyjad.Nimi, Max(Myyjad.Vanus) As Vanus
FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
GROUP BY Linnad.Linn, Myyjad.Nimi
ORDER BY Linnad.Linn;
The problem is, it seems to ignore the MAX, and just shows all of the values, and I can't remove the group by Myyjad.Nimi, because it gives me an error that aggregate function not included for Myyjad.Nimi.
And the output should be:
Town - Name - Max(Age)
Also, Linn = Town, Nimi = Name and the Vanus = Age.

Answer 1

I think this may be what your looking for:
SELECT L.Linn, M.Nimi, M.Vanus
FROM Linnad As L,
(
SELECT M2.LinnID, M2.Nimi, M2.Vanus
FROM Myyjad As M2
WHERE M2.Vanus = (SELECT Max(Z.Vanus) FROM Myyjad As Z WHERE Z.LinnID = M2.LinnID)
) As M
WHERE M.LinnID = L.LinnID
This performs a sub-select to get a list of the Linn ID's with all Nimi's showing the maximum Vanus, then we link this sub-select back to the Linnad table via the LinnID.

Answer 2

I think you want:
SELECT Linnad.Linn, Myyjad.Nimi, Myyjad.Vanus
FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
WHERE DateValue(Myyjad.Vanus)
= (SELECT Max(DateValue(Myyjad.Vanus)) FROM Myyjad)
ORDER BY Linnad.Linn
Top N per group:
SELECT Linnad.Linn, Myyjad.Nimi, Myyjad.Vanus
FROM FROM Linnad INNER JOIN Myyjad ON Linnad.LinnID = Myyjad.LinnID
WHERE Myyjad.ID In (
SELECT Top 1 m.ID
FROM Myyjad m
WHERE m.LinnID=Linnad.ID
ORDER BY m.Vanus Desc, m.ID)

Answer 3

Grouping by Linn (town) and Nimi (name) tells the db engine to give you one row for each combination of town and name, and show you the maximum Vanus (age) for each of those combinations. And logically, that's not what you want. You want the name of each person whose age is the same as the maximum age in that town.
First verify you can retrieve the max age for each LinnID.
SELECT
LinnID,
Max(Vanus) As MaxOfVanus
FROM
Myyjad
GROUP BY LinnID;
If that works, you can save it as "qryTownAge", then use it in another query where you join it (on LinnID) with Linnad. That will allow you to retrieve the matching Linn.
SELECT l.LinnID, l.Linn, q.MaxOfVanus
FROM
Linnad AS l
INNER JOIN qryTownAge AS q
ON l.LinnID = q.LinnID
ORDER BY l.Linn;
If that works, save it as qryTownAge2. Then try this query.
SELECT q.Linn, q.MaxOfVanus, m.Nimi
FROM
qryTownAge2 AS q
INNER JOIN Myyjad AS m
ON (
m.LinnID = q.LinnID
AND m.Vanus = q.MaxOfVanus
)
ORDER BY q.Linn;
If that all works, you could create a single query which does it all. However, doing it step by step should help us pinpoint errors.