What are SQL window functions? Explain aggregation and joins.

Hard Difficulty

Hard questions require advanced understanding and critical thinking. Here, your problem-solving skills are key, as these questions often involve complex scenarios needing in-depth analysis and well-structured responses.

SQL question

SQL questions test your ability to work with relational databases. Demonstrate your proficiency in writing queries, understanding database design, optimizing performance, and extracting meaningful information from structured data.

Here's a Hint

Prepare examples that demonstrate row-by-row processing in window functions versus group-based aggregation, and different join types with use cases.