358. Consecutive Order-Day Streaks (per Employee)

Hard Deloitte Real-World Scenarios

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

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locations

3 cols

departments

3 cols

employees

6 cols

orders

6 cols

Reference Solution

Expected SQL

WITH grp AS (SELECT emp_id, order_date, DATE(order_date, '-' || ROW_NUMBER() OVER (PARTITION BY emp_id ORDER BY order_date) || ' days') AS grp_key FROM orders), streaks AS (SELECT emp_id, COUNT(*) AS streak_length FROM grp GROUP BY emp_id, grp_key) SELECT emp_id, MAX(streak_length) AS longest_streak FROM streaks GROUP BY emp_id HAVING MAX(streak_length) >= 2 ORDER BY longest_streak DESC, emp_id;

SQL Editor

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Console Output

Console Terminal

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