/courses/sql/window-functions/Recent content in Window Functions on DATATWEETSHugoenCopyright (c) 2025 DatatweetsTue, 23 Jun 2026 09:00:00 +0200/courses/sql/window-functions/lesson-1-introduction-to-window-functions/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-1-introduction-to-window-functions/Discover how window functions aggregate data without collapsing rows. Learn the OVER() clause, split windows with PARTITION BY, and order them with ORDER BY./courses/sql/window-functions/lesson-2-window-frames-rows-and-range/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-2-window-frames-rows-and-range/Learn window framing. Use ROWS BETWEEN and RANGE BETWEEN with PRECEDING, FOLLOWING, CURRENT ROW, and UNBOUNDED to define exactly which rows a function sees./courses/sql/window-functions/lesson-3-window-aggregate-functions/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-3-window-aggregate-functions/Use SUM, AVG, MIN, MAX, and COUNT as window functions. Add aggregates to non-aggregate and aggregate queries, and learn why window functions cannot go in WHERE./courses/sql/window-functions/lesson-4-ranking-functions-row_number-rank-and-ntile/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-4-ranking-functions-row_number-rank-and-ntile/Rank rows within partitions using ROW_NUMBER, RANK, DENSE_RANK, and NTILE. Learn how each handles ties and how to solve top-N and bucketing problems./courses/sql/window-functions/lesson-5-offset-functions-lag-lead-and-first_value/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-5-offset-functions-lag-lead-and-first_value/Use LAG and LEAD to compare rows to their neighbors, and FIRST_VALUE, LAST_VALUE, and NTH_VALUE to pull fixed positions from a window. Build period-over-period metrics./courses/sql/window-functions/lesson-6-distribution-and-percentile-functions/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-6-distribution-and-percentile-functions/Measure where a value falls with CUME_DIST and PERCENT_RANK, compute percentiles with PERCENTILE_CONT and PERCENTILE_DISC, and tidy queries with the WINDOW clause./courses/sql/window-functions/lesson-7-guided-project-sales-analytics-for-northwind-traders/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/window-functions/lesson-7-guided-project-sales-analytics-for-northwind-traders/Act as a data analyst for Northwind Traders. Rank employees, build running totals, track month-over-month growth, find high-value customers, and surface top products.