01Which SQL sub-language is used to define or modify the database structure (e.g., CREATE TABLE)?
02Which JOIN type returns all records from the left table, even if there is no match in the right table?
03What is the 'Phantom Read' anomaly in database transactions?
04What is a 'Recursive CTE' typically used for?
05Which SQL Window Function would you use to find the top 3 highest-paid employees in each department, allowing for ties?