理解 SQL 中的 GROUP BY 与 PARTITION BY
原文英文，约900词，阅读约需3分钟。发表于：。Both GROUP BY and PARTITION BY are used to organize and work with data, but they serve different purposes and are used in different contexts. Let’s dive into the details of each and explore how...
GROUP BY和PARTITION BY用于组织和处理数据，但用途和上下文不同。GROUP BY用于按列分组并应用聚合函数，减少行数。PARTITION BY用于分区结果集，不合并行，可应用聚合函数。GROUP BY总结数据，PARTITION BY用于排名、累计计算等。了解何时使用每个关键是高效查询的关键。
