Without a primary key, ACCESS has no way of identifying each record
uniquely. That is why your query is not updatable. You must set up a primary
key in the table so that each record has a unique identifier.
SQL is the language used by database engines to run queries. In ACCESS, you
can see the SQL statement if you open the query in design view, then click
on the View icon on toolbar and select SQL from the list of options.
I suggest that you obtain a book about ACCESS and read about table
structures and database design. These concepts are crucial to your success
in setting up and using ACCESS databases. There are many good books at
bookstores, and John Viescas (ACCESS MVP) has a list of suggested books at
his website:
www.viescas.com.