Relational Databases Development Tutorials, Guides & Insights

SELECT sale_id, employee_id, amount,
       LEAD(amount, 1) OVER (ORDER BY sale_id) AS next_sale
FROM sales;

Advanced SQL techniques like subqueries, unions, and window functions allow you to solve complex data challenges and gain deeper insights. Practice these concepts on real-world datasets to strengthen your SQL skills and become proficient in handling advanced query scenarios.

SELECT columns
FROM table1
CROSS JOIN table2;

Using the same tables, to generate a combination of all employees and all departments: