# FAQ: Conditional Aggregates - CASE WHEN

#1

This community-built FAQ covers the “CASE WHEN” exercise from the lesson “Conditional Aggregates”.

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This exercise can be found in the following Codecademy content:

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#2

Hi everyone!! Can anyone explain how “GROUP BY” statements work? I’ve seen a few explanations but none of them seem consistent with the way we have used them in the course, or at least i’m not catching on. Any help is appreciated! thanks

#3

GROUP BY let’s us specify which columns from the table to use and their order from left to right.

``````GROUP BY 1
``````

Notice that column 1 is `elevation_tier`?

#4

I see! and ORDER BY does the order from top to bottom?

thank you!

#5

Correct; ORDER BY is a sort order clause, hence the parameters, `ASC` and `DESC`.