Aggregate Functions

Database records flow into customer totals and average-value comparisons for SQL subqueries.

SQL Subqueries: Compare Orders and Customer Totals with Averages

August 27, 2026

Explore SQL subqueries by comparing order values and customer spending totals with calculated averages. Includes joins, grouping, filtering, common mistakes, and practice challenges.

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Sales records grouped by product category and summarized into monthly totals

SQL GROUP BY and Aggregate Functions: A Beginner’s Guide

August 26, 2026

Learn to summarize SQL data with GROUP BY and aggregate functions using practical sales examples, filtering, sorting, and beginner-friendly exercises.

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