Code RoomDuplicate subscriptions
HardPrep Room Coding #5087

Duplicate subscriptions

SQLAlgorithms & data structuresSenior~13 min

Find accounts with more than one subscription record. Return `name` and `subscriptions`, alphabetically.

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 13 min

Expected, in this order

namesubscriptions
Acme2

Your result

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1 more set of rows are waiting. Free with an account.