Code RoomEvent frequency and reach
MediumPrep Room Coding #5124

Event frequency and reach

SQLAlgorithms & data structuresMid~10 min

For each event name, return `name`, `events` and `users`: how many times it happened and how many distinct people did it. Order by name.

What a strong answer looks like

Say what the query is meant to return before you write it, and name the shape of the answer: how many rows, grouped by what. Then watch the NULLs and the duplicates, because that is where most of these are lost.

Run onlyA query runs as one statement, so there is nothing to step through. Run it and read the rows.

0:00 of about 10 min

Expected, in this order

nameeventsusers
purchase22
signup55
view64

Your result

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