How to create a primary key in access

[iruwin50]

Hi, Very new to access and database building. I have been asked to build a database and am struggling for advice. I was given two excel sheets: an updated and an older inventory list. The updated version has new added rows, changed rows, and deleted rows from the old one. I was asked to figure out which rows were changed, added, or deleted. The problem i came up with is that I have not been able to make a primary key and would need to make a primary key of more than one field because for every one PC (for example) there is a column that has either update, deleted, added. In theory I should be able to make a primary key based on the PC column and the update/delete/add column so that there is one pc name to either an update/delete/add column. Any advice on how to proceed?

[zmbd]

Two links to start with:
A Tutorial for Access

Database Normalization and Table Structures.

These will help you sort things out.
As for actual table design, you've given next to nothing to work with... no column headers, no example data and as such, this general answer is more than likely an example of the solutions you'll receive.

[NeoPa]

Primary Keys (PKs) can be set up with multiple fields. Unfortunately, as you give little to no information on the question you want to ask, it is very much harder to answer your question more helpfully than that.