In Access terminology, there's no such thing as a "query table". You have
tables, that store data, and queries, that select/return data (and do other
things).
You want to add a column. What will be in that column? Will you need to
keep whatever it is permanently? If so, maybe you need to add a column to a
table.
Will it be for display only? If so, you can create a new field in a query
you already have, and either display an additional field from the table, or
use an expression to show something new -- the key here is that you DON'T
need to preserve whatever it is, just show it each time you run the query.
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