From event_data, return event_id and JSON_EXTRACT_SCALAR(payload, '$.currency') AS currency for even

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Problem

From event_data, return event_id and JSON_EXTRACT_SCALAR(payload, '$.currency') AS currency for event_type = 'purchase'. Group by currency and count events per currency as events_for_currency. Exclude rows where currency IS NULL. Order by events_for_currency DESC, currency.

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