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In Access 2010 Power Shortcuts, Access expert Alicia Katz Pollock shares hundreds of tips and shortcuts to vastly increase efficiency and get the full power out of Access 2010. The course includes tips for working with the Ribbon and Quick Access toolbar, managing files, customizing and automating Access, rapid data entry and editing, working with tables, queries, forms, and reports, managing your database, and much more. Exercise files accompany the course.
Your database is only as good as the data that's entered into it, and unfortunately we are all human, and we do make mistakes. If you've designed your table structure well, you can eliminate a lot of incorrect data, but not everything. It's almost inevitable that you'll eventually find some records entered more than once, with just a few discrepancies between the fields. Access has a find duplicates query that will allow you to compare records and identify potential repeats. Let's say it's the end of the year and it's time to clean up my data. I can run this query in my Customers table to make sure that no one created two accounts for the same entity.
I'll go to the Create ribbon and then click on the Query Wizard. Click on the Find Duplicates Query Wizard and click OK. We are going to base our query on the Customers table, so click Next. Now we have to select the fields. This is the tricky part. If you pick one that's likely to have variations like the Address Field you're less likely to find identical records, and if you picked too many fields just one discrepancy will eliminate erroneous record from the query results.
So think carefully about your data and which fields would be likely to be the same and which would help you identify duplications. For example, I want to choose City I'll move it over to the right-hand side. Since duplicates will likely be in the same town, and it's less likely to have typos. I'll also choose the WorkPhone. When I click Next, now it wants to know which fields I want to see in the results? I want to see all of them for the best comparison. So I'll click the double-headed arrow in the middle of the window to move all the fields to the right-hand side.
I'll keep the default name and click Finish. Sure enough, I have a few duplicates. Katz's Deli was entered with two different company names. A typo by two different sales reps. I probably shouldn't just delete this erroneous record. I might delete associated orders or other data. I'll need to talk to my reps and change the Customer number on previous orders. Once that's been done, I can delete the extra record and run the query again to look for additional duplicate data.
Performing this query on regular basis will help keep your data error free.
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