Join products and orders to find cumulative sum
Last updated: November 23, 2025
Quick Overview
Write a query joining products and products to produce the combined cumulative sum.
Rippling
November 23, 202531
7
1,970 solved
Write a query joining products and products to produce the combined cumulative sum.
Data manipulation questions at Rippling test your ability to work with real-world datasets. This Technical Screen question evaluates your SQL proficiency, understanding of data modeling, and ability to derive insights from raw data.
What the Interviewer Expects
- Solve complex analytical problems with elegant, readable SQL
- Optimize queries for large-scale datasets with partitioning and indexing
- Use recursive CTEs, lateral joins, and advanced window functions
- Design the data model alongside the query solution
- Discuss trade-offs between SQL and programmatic approaches (Python/pandas)
- Consider the operational aspects: query scheduling, incremental processing
Key Topics to Cover
How to Approach This
- Clarify the schema and expected output format before writing queries.
- Use CTEs (WITH clauses) to break complex queries into readable steps.
- Consider window functions (ROW_NUMBER, RANK, LAG, LEAD) for ranking and sequential analysis.
- Watch for NULLs, duplicates, and edge cases in JOINs and GROUP BY.
- For pandas, prefer vectorized operations over row-by-row iteration.
Possible Follow-up Questions
- What indexes would you create to support this query?
- How would you validate the correctness of your query results?
- How would you handle this if the data was spread across multiple databases?
- What would you do if this query needs to run every 5 minutes?
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Practice SQL ProblemsSample Answer
Problem Understanding
To solve the problem, we need to understand the data structure involved. We have two tables: products and orders. The products table contains information about different products, including thei...
Approach
- Identify the Join: We need to perform an INNER JOIN between the
productsandorderstables using the product ID to combine relevant details. - Select Required Fields: From the joined ...
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