**Intact Gift Giving Condition book**

Correct SQL takes judgment. SQL is easy to write. SQL Puzzles & Brain Teasers is a hands-on collection of more than 150 challenges designed to strengthen the way you reason about queries—not merely the syntax you remember. Work through realistic scenarios involving missing rows, misleading aggregates, NULL logic, joins, dates, ranking, window functions, recursive CTEs, set operations, gaps and islands, relational division, and more.