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, 2025
Data 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
  1. Clarify the schema and expected output format before writing queries.
  2. Use CTEs (WITH clauses) to break complex queries into readable steps.
  3. Consider window functions (ROW_NUMBER, RANK, LAG, LEAD) for ranking and sequential analysis.
  4. Watch for NULLs, duplicates, and edge cases in JOINs and GROUP BY.
  5. For pandas, prefer vectorized operations over row-by-row iteration.
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