Two Transactions Ago... :Analyze Each Customer’s Transaction History with Their Transaction from Two Periods Ago Intermediate
Display each transaction alongside the one that occurred two transactions earlier for the same customer.
The accounting team wants to analyze historical transaction patterns. Write a query to display each transaction along with the transaction ID and amount from the transaction two periods earlier for each customer.
Write Your Query
This represents financial analysis where accountants examine past transactions to identify spending consistency and behavioral patterns.
You’ll practice referencing earlier records within grouped data to analyze previous transaction details and historical spending behavior.
This problem is labeled as Intermediate. It assumes you’ve written a few window function queries before, but you don’t need to be an expert. Use the hints and explanations if you get stuck — they’re there to help you think through the logic.
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SQL Cookbook (O’Reilly)
Practical SQL recipes for real-world querying—great complement to hands-on practice.
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