402. 7-Day Moving Average of Sales

Hard FinTech Time Series Analysis

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

SELECT order_date, SUM(amount) AS daily_sales, AVG(SUM(amount)) OVER (ORDER BY order_date ROWS BETWEEN 6 PRECEDING AND CURRENT ROW) AS moving_avg_7d FROM orders GROUP BY order_date;

SQL Editor

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Console Output

Console Terminal

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