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By mswatcher
via periscope.io
Submitted: Jan 24 2014 / 04:15

Count distinct is the bane of SQL analysts, so it was an obvious choice for our first blog post. First things first: If you have a huge dataset and can tolerate some imprecision, a probabilistic counter like HyperLogLog can be your best bet. (We'll return to HyperLogLog in a future blog post.) But for a quick, precise answer, some simple subqueries can save you a lot of time.
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