Let's say you have a list of email addresses that you collected through a form on your website. You want to know how many email addresses you received, but you're worried that someone may have filled out the form twice, which would inflate your numbers. When you're working with large amounts of data in a spreadsheet, you're bound to have duplicate records. Whether it was human error or robots that put them there, those duplicates can mess with your workflows, documentation, and data analysi...
