Calculate conversion rate per user from orders
Last updated: August 17, 2025
Quick Overview
Write SQL to compute conversion rate grouped by user from orders, handling nulls and duplicates.
Walmart
Data Manipulation (SQL/Python)
Data Scientist
Walmart
August 17, 2025Data Scientist
Onsite
Data Manipulation (SQL/Python)
Medium
689
15
3,090 solved
Write SQL to compute conversion rate grouped by user from orders, handling nulls and duplicates.
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.
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Practice SQL ProblemsSample Answer
Problem Understanding
The goal is to calculate the conversion rate per user based on their orders. This requires understanding the relevant data, which typically includes a user identifier and a timestamp or status indicat...
Approach
- Identify the relevant tables: We need a table that contains user orders with at least the following columns:
user_idandorder_status. - Aggregate the data: Use a GROUP BY clause to group the...
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