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Lets try a few more advanced SQL features. Ive been logging heart rate for each of my exercises, and I havent done anything interesting with this data yet. So now its time. I did a little research on the Internet, and I found that the maximum heart rate is 220 minus your age. So one thing I can do is query my logs to see if my heart rate ever goes above max, since that would be pretty scary, or tell me that theres something wrong with my heart rate checking device. Okay, to do that, Im going to do a `COUNT(*)`. So `COUNT(*) FROM exerciselogs` and then `WHERE heartrate` greater than 220 minus my age, 30. Woo hoo, theres no results, and that makes my heart happy. Now, notice Im using the subtraction operator? And in fact, I can use most math operators in SQL, like to add, subtract, multiply, or divide. And if I need to, just like in math, I can throw in parentheses and change the order of evaluation. All right, so, weve confirmed that my heart doesnt go above max, thats goo