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+create DATABASE a1 charset utf8;
+use a1;
+create table if not exists `employee`
+(
+    `eid` int not null auto_increment comment '员工id' primary key,
+    `ename` varchar(20) not null comment '员工名称',
+    `dname` varchar(50) not null comment '部门名称',
+    `hiredate` datetime not null comment '入职日期',
+        `birth` date not null comment '生日',
+    `salary` double null comment '基本薪资',
+        `start_sal` double null comment '入职薪资'
+);
+
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('傅嘉熙', '开发部', '2002-08-20 12:00:04','1980-12-10', 9000,6500);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('武晟睿', '开发部', '2002-06-12 13:54:12', '1984-2-5',9500,6000);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('孙弘文', '开发部', '2003-10-16 08:27:06','1979-8-7', 9400,8000);
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('潘乐驹', '开发部', '2004-04-22 03:56:11','1980-5-12', 9500,6800);
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('潘昊焱', '人事部', '2007-02-24 03:40:02','1987-2-12', 5000,4500);
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('沈涛', '人事部', '2012-12-14 09:16:37','1993-4-30', 6000,5500);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('江峻熙', '人事部', '2018-05-12 01:17:48','1990-6-8', 5000,3000);
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('陆远航', '人事部', '2018-04-14 03:35:57','1989-11-13', 5500,5000);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('姜煜祺', '销售部', '2020-03-23 03:21:05','1995-1-1', 6000,5500);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('邹明', '销售部', '2015-11-23 23:10:06','1996-2-19', 6800,6000);
+insert into `employee` (`ename`, `dname`, `hiredate`, `birth`,`salary`,`start_sal`) values ('董擎苍', '销售部', '2012-02-12 07:54:32','1985-10-7', 6500,4800);
+insert into `employee` (`ename`, `dname`, `hiredate`,`birth`, `salary`,`start_sal`) values ('钟俊驰', '销售部', '2010-04-10 12:17:06','1981-3-25', 6000,3500);
+-- 员工按工龄，每年增加50元薪水。实发薪资 = 基本薪资 + 工龄 * 50
+
+### -- 窗口函数
+
+SELECT * from employee;
+#求每个部门的员工总数
+SELECT distinct dname,count(ename) over (PARTITION by dname) 总人数 from employee ;  
+#求每个部门的平均工资
+SELECT distinct dname,avg(salary )over (PARTITION by dname)  平均工资 from employee;
+#求每个部门的工资排名（从高到低,相同工资并列，并执行跳过排序）
+select ename,dname,salary,rank() over (PARTITION by dname ORDER BY salary desc) 工资排名 from employee;
+#求公司所有员工的年龄排序（相同年龄并列，执行跳过排序）
+SELECT ename,birth ,RANK() over (ORDER BY birth ) 年龄排序 from employee;
+#求每个部门的员工工龄排序（相同年龄并列，执行顺序排序）
+SELECT dname,ename,hiredate, row_number  over ( ORDER BY hiredate,datediff(now(),hiredate )  )工龄排序 from employee ;
+#计算每个员工的工资与该部门平均工资的差额
+SELECT ename,salary,start_sal 
+
+
+
+
+
+#按员工工资进行排序，比较相邻两个员工的工资，输出比较高的工资
+
+select ename,salary,
+    max(salary) over ( order by salary rows between current row and 1 following) 工资比较, 
+from employee;
+
+#按员工工资进行排序，查询当前员工与前一位和后一位的工资平均值
+
+select ename,salary,
+    avg(salary) over (order by salary rows between 1 preceding and 1 following)
+from employee;
+
+#按员工工资进行排序，查询当前员工至最后一位员工的工资总和
+
+select ename,salary,
+    sum(salary) over (order by salary rows between current row and unbounded following ) from employee;
+
+#计算每个部门内最高薪资与平均薪资的差额
+
+
+
+#找出各部门年薪第二高的员工
+
+
+
+#查询各部门中小于等于当前员工实际薪资的比例
+
+select ename,salary,cume_dist() over (partition by dname order by salary) as 员工实际薪资的比例 from employee;
+
+#查询每个员工工资在全部员工中的排名比例
+
+select ename,salary,sum(salary) over (order by salary) 总工资,salary/sum(salary) over () as 排名比例 from employee;
+
+#查询每个部门工资排名在前25%的员工记录数
+
+
+
+#每个部门按年龄进行排序，求当前员工与前一位员工的年龄差
+
+select ename,birth,
+        datediff(lag(birth,1) over (order by birth),birth) 年龄差 from employee;
+
+#按入职日期进行排序，查询公司每个员工与后面一个员工的入职天数差异
+
+select ename,hiredate, datediff(lead(hiredate,1) over (order by hiredate),hiredate) 入职天数差异 from employee;
+
+#将每个部门的员工按工资平均分为2个组，组1为低工资，组2为高工资
+
+
+
+
+#将所有员工按照工龄分为4个组，并统计每个组的人数
+
+
+
+#将员工按照工资分为3个组，并统计组别，每组平均工资，工资范围（first_value、last_value）
+
+
+
+### -- 非窗口函数
+
+#按照工龄区分等级，小于5年为新员工,5-15年为老员工,大于15年为骨灰级员工,输出姓名，部门，工龄，级别
+
+#返回员工的实际年龄，如果小于当前日期则减1岁
+
+
+
+
+
+#求每个员工还有多少天过生日，并返回下次生日是星期几
+
+#求每个员工当前实发工资与入职时工资的增长率,输出员工姓名,部门,入职工资,实际工资,增长率