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

Instruction

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

Exercise

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.