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Unique Reporters per Content
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid
Problem
In the chat data, each message can be a reply to content. For each content reference, count unique reporters identified by combining sender and channel. Only count messages that are replies (reply_to is not null). Return the content ID and the reporter count.
Practice This Problem
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