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Revision
So you think you can count
5. Problems with subtraction
Round and other functions
Revision and practice

## Instruction

Great! As you might expect, these simple operations can also get very tricky. Let's discuss them now.

For a character Mnah select name, weight, height and the result of the following calculation: weight - height - weight + height. It should equal 0, right?
Introduce a WHERE clause and remember to put the character name in apostrophes.