This project is focused on mastering subqueries in SQL through hands-on practice using two different databases: one for employees and one for customers. The repository includes a series of structured ...

This project demonstrates how to use subqueries in Google BigQuery to analyze sales performance across multiple dimension tables. Specifically, it answers the question: "How many Lenovo products were ...

I need to get SUMs from two different related tables, and I'm stumped as to how (and haven't managed to successfully slog through the documentation). SELECT si_invoices.index_id, si_invoices.date, ...