Learn what aggregate functions are, how to use them in SQL queries, and why they are useful for BI. Find examples of common scenarios and calculations.

Learn how to easily fix the your query does not include the specified expression as part of an aggregate function SQL error.

Bug: The bug.sql file contains a query that attempts to calculate the total number of orders, average order total, and displays the customer ID without grouping. This produces an inaccurate result.

Data warehouse (DW) is always subjected to large and complex workloads of queries. Aggregate function computation and iceberg queries are important and common in many applications of data mining and ...