mysql窗口函数（保姆级文档）

第一步： 创建数据库

CREATE DATABASE jwdg

USE `jwdg`;

第二步： 创建表格

DROP TABLE employee;
CREATE TABLE employee(
employee_id INT PRIMARY KEY, -- 员工id
employee_name VARCHAR(50),-- 员工姓名
employee_sex CHAR(3), -- 员工性别
employee_age INT, -- 员工年龄
department VARCHAR(50), -- 部门名
entry_date DATE, -- 入职日期
salary DOUBLE -- 薪资
)ENGINE=INNODB DEFAULT CHARSET=utf8;

第三步：插入数据

INSERT INTO employee VALUES(75001,'张三',"男",26,'人事部','2022-01-01',4000);
INSERT INTO employee VALUES(75002,'李四',"男",35,'人事部','2022-01-02',9000);
INSERT INTO employee VALUES(75003,'王五',"男",25,'人事部','2022-01-03',7500);
INSERT INTO employee VALUES(75004,'六毛',"男",31