1 定义
窗口函数,又称分析函数
Analytic functions compute an aggregate value based on a group of rows. They differ from aggregate functions in that they return multiple rows for each group.
The group of rows is called a window and is defined by…
窗口函数语法结构:
分析函数() over(partition by 分组列名 order by 排序列名 rows between 开始位置 and 结束位置)
开窗函数和聚合函数区别: 聚合函数会对一组值进行计算并返回一个值,常见的比如sum(),count(),ma…
窗口函数
CREATE TABLE students ( id INT PRIMARY KEY auto_increment, NAME VARCHAR ( 30 ), math INT, english INT, num INT );
INSERT INTO students ( NAME, math, english, num )
VALUES( "张三", 99, 88, 4 ),( "李四", 77, 88, 5 ),( "王五…