Python makes it simple to integrate with both relational and non-relational databases, enabling you to build robust, data-driven applications. With connectors for SQLite, MySQL, PostgreSQL, and ...

COUNT(DISTINCT transaction_id) AS number_of_sales, COUNT(DISTINCT product_id) AS number_of_products, COUNT(DISTINCT store_id) AS number_of_stores WHEN date_format(transaction_time, 'HH:mm:ss') BETWEEN ...

JOIN menu m ON s.product_id = m.product_id GROUP BY customer_id; Explaination: This query joins the sales and menu tables to calculate the total amount each customer spent by summing up the prices of ...

In 2026, entry-level and transition roles often expect more than passive course completion. Employers want to see that you can write queries that answer business questions, work with browser logic, ...