Writing complex analytical queries with self-joins and subqueries? Window functions perform calculations across rows without grouping. Common Window Function Patterns: — Basic structure SELECT column1, column2, WINDOW_FUNCTION() OVER ( PARTITION BY partition_column ORDER BY sort_column ROWS/RANGE BETWEEN frame_start AND frame_end ) AS calculated_column FROM table_name; — Available functions: — Ranking: ROW_NUMBER(), RANK(), DENSE_RANK(), NTILE() — […]