Purchase payloads contain an items array, each item an object with sku and qty

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

Domain

SQL

Difficulty

medium

Problem

Purchase payloads contain an items array, each item an object with sku and qty. Return event_id, the number of items in the order, and the sku of the FIRST item, for each purchase event, ordered by event_id. Columns: event_id, n_items, first_sku.

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