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SQL 75
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403. Customer Retention (Repeat Buyers)

Medium E-Commerce 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, COUNT(order_id) AS total_orders FROM orders GROUP BY customer_name HAVING COUNT(order_id) > 1 ORDER BY total_orders DESC;
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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