From transactions, return transaction_id, user_id, total_amount, and LAG(total_amount) OVER (PARTITI

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

Domain

SQL

Difficulty

medium

Problem

From transactions, return transaction_id, user_id, total_amount, and LAG(total_amount) OVER (PARTITION BY user_id ORDER BY transaction_date) AS prev_amount. Order by user_id, transaction_date.

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