Column headings are not excluded due to 'Show' check box is checked.
Cause:
By default, in Query Design view, all field names added to a query are set to 'Show'.
Solution:
In Query Design view, clear the 'Show' check box for desired fields.
1) If the Database window is not active, activate the Database window.
2) Click the 'Queries' tab in the Database window.
Queries tab
3) Select the desired query in the list box. (The selected query is highlighted.)
4) Click 'Design'. (The query appears in Design view.)
5) Clear the 'Show' check box in the column of the field to be excluded.
6) Repeat step 5) for each additional field to be excluded from displaying in the query datasheet.
7) Select the 'File' menu and select 'Save' to save changes to the query.
