SQL Practice
SQL 75
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Basics & Filtering Aggregation & Grouping Joins (All Types) Subqueries & Correlated CTEs & Adv. Subqueries Window Functions Advanced & Tricky Schema Design & Opt.
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410. Churn Risk (No Orders > 6 Months)

Hard SaaS Retention & Churn
Query Rules
  • The query columns and order must match the expected result schema.
  • NULL values should be handled appropriately where applicable.
  • The grader compares output values and sorting order to evaluate.

Schema Browser

Click a table's header to toggle expand/collapse.
locations
3 cols
departments
3 cols
employees
6 cols
orders
6 cols

Reference Solution

Expected SQL 
SELECT customer_name, MAX(order_date) as last_order FROM orders GROUP BY customer_name HAVING last_order < date('2025-12-11', '-6 months');
SQL Editor
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Console Output

Console Terminal

Write your query and click "Run Query" (Ctrl + Enter) to see results and testcase validation.

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