MS-Access组合框控制源

Question

Is it possible to use an IIf statement in the control source of a combo box? I have a combo box that I want to pull a series of names from the associated table if their position is like "Ops". Here is what I have tried in the control source for the combo box.

=IIf(Roster!Position Like "Ops*",Roster!Last,"")

I am fairly sure it is possible, what am I doing wrong?

Mods based on feedback from HansUp

SQL for query

SELECT Roster.Last
FROM Roster
WHERE (((Roster.Position) Like "Ops*"))
GROUP BY Roster.Last;

Combo Box: Supervisor

Control Source
=Supervisor!Last

Still returns no data.

Answer 1

I have a combo box that I want to pull a series of names from the associated table if their position is like "Ops".

Use a query as the combo's Row Source.

SELECT [Last], [another field ?]
FROM Roster
WHERE Position Like "Ops*";

Then the combo's Control Source can be a query field.