Senior SQL Test

This test is designed for senior SQL professionals capable of handling logic-heavy queries, performance-oriented constructs, and multi-step calculations. It includes 7 coding exercises and 3 theoretical questions using the APPXS_employee, APPXS_department, and APPXS_educationlevel tables. Concepts covered include window functions, CTEs, correlated subqueries, cross-entity aggregations, and edge-case handling. Questions are crafted to test fluency in SQL reasoning, not just syntax.