Not only can't you do that, its making alarm bells go off that indicate your table is improperly structured.
In a query, you must define which fields show--and then they show for all records. THink of a query as a dynamic generated spreadsheet. You can make column A show, but its going to show for every record, you can't show column A for rows 1-5, but then hide it for row 6, show it for rows 7 and on. Either the column shows or it doesn't.
Like I said though, asking that question is an indiciation of larger problems. While you can think of a query as a dynamic spreadsheet, you can't think of tables like that. Tables need to be structured properly, that process is called normalization (
http://en.wikipedia.org/wiki/Database_normalization). I'm not certain you've done that.
Can you post sample data from your table and then what you would like this query to return? Again, demonstrate what you want with data--show starting sample data from your table (include table and field names) and then show what data should be returned from the query you hope to write.
