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所在平台: Udemy |
课程主页: https://www.udemy.com/course/sql-window-functions-for-business-analytics/
课程评论：没有评论
**课程总结：EssentialSQL: 商业分析的SQL窗口函数** 本课程将教您如何利用SQL窗口函数来简化查询，提升商业分析能力。您将学会： * **掌握窗口函数的核心概念：** 理解窗口函数如何与PARTITION BY等子句协同工作，实现运行总计、前后行值比较等功能。 * **构建复杂查询：** 结合JOIN语句和窗口函数，创建更强大、更灵活的SQL查询。 * **避免使用游标：** 学习使用LEAD和LAG函数，替代繁琐的游标操作。 * **跨数据库应用：** 无论您使用MySQL、PostgreSQL、SQLite还是SQL Server，都能有效运用本课程所学。 * **理解窗口帧（Window Frame）：** 学习如何设置窗口帧及其对函数计算的影响。 * **区分窗口函数与GROUP BY：** 了解它们的异同，并选择最适合的分析方法。 * **运用多重窗口函数：** 在同一个查询中叠加使用多个窗口函数，实现更精细的数据处理。 * **嵌套使用窗口函数结果：** 将一个窗口函数的结果作为另一个窗口函数的基础进行计算。 * **熟练运用三类函数：** 掌握聚合函数、排名函数和分析函数在窗口函数中的应用。 **学习目标：** * **获得知识：** 快速掌握窗口函数，将SQL技能提升到新的水平。 * **建立信心：** 确保您的学习方向正确，并自信地应用所学知识。 * **达成成就：** 学习一项能够脱颖而出的实用技能。 完成本课程后，您将深刻理解窗口函数的强大之处，克服学习的畏难情绪，并能够运用它们大幅简化复杂的SQL查询。
In this Course you will Learn to:Write simpler queries using window functions.Know how window functions work with partition and other clauses to help you form running totals or compare values from one row to the next.Create complex queries involving joins using window functions.Learn how to use LEAD and LAG to avoid using cursors in your SQL scripts.Write window functions using MySQL, PostgreSQL, SQLite, or SQL Server - your choice! I'm sure they will work with Oracle, I just haven't tested.:)Understand how to set up a window frame and their affect on the window function.Know the difference between window functions and classing GROUP BY results.Work with multiple window functions within a query.Who to use results from a window functions within the same query.Learn to us the three classes of functions: Aggregate, Ranking, and Analytic functions.Nothing is worse thanBeing excited to learn something new but not knowing where to start.Wasting time learning the wrong features.You being overwhelmed with options and not knowing which to use.Imagine Having...Knowledge - Knowing how to quickly use window functions to take your SQL to the next level.Confidence - Feeling good that you're on the right track.Accomplishment - Having a sense of accomplishment that you've learned something most cannot.By the time you've completed this course you'll have an appreciation of window functions, overcome your fear, and able to use them to simplify some of your very complex queries.
