👉 Learn how to evaluate a piecewise function. A piecewise function is a function which uses different rules for different intervals. When evaluating a piecewise function, pay attention to the ...

👉 Learn how to find the inverse of a function. The inverse of a function is a function that reverses the "effect" of the original function. One important property of the inverse of a function is that ...

sum(case when customer_feedback = 'Very Good' then 1 else 0 end) as very_good, sum(case when customer_feedback = 'Good' then 1 else 0 end) as good, sum(case when ...