title: How to subtract two sets of values in Google Spreadsheets?
body: <p>I have two sets of values in <code>A:A</code> and <code>B:B</code>. How to make a set difference between them (preferably using a formula), i.e. get those values from <code>A:A</code> that do not exist in <code>B:B</code>?</p>