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So you think you can count?
Rounding functions and more
Review and practice


Great! In PostgreSQL, simple operations can get very tricky. Let's discuss some of them, starting with subtraction.


For a character named 'Mnah', select the name, weight, height, and the result of the following calculation:

weight - height - weight + height AS zero

It should equal 0, right?

Stuck? Here's a hint!

Introduce a WHERE clause, and remember to put the character name in apostrophes.