Database Elements

We plan to share knowledge regarding database processing.

We have a database of a client. We want to keep their information anonymous. So we just use the general elements of the database for reference.

We currently have their Invoices table. The fields (columns) are: Invoice Number, Due date, Customer name, Government ID, Address, currency type, units, unit of measurement, description, price, tax1, subtotal, sale tax, total and notes.

We also have the clients table. The fields (columns) are: Customer name, Governement ID, Address, notes.
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We want to know the customers that did not buy from us this year. So we create a query that find records or rows in one table that have not related records on another table. We are working in Microsoft Excel and Microsoft Access.

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