diff --git "a/\351\231\210\347\253\213\346\231\272/.keep" "b/\351\231\210\347\253\213\346\231\272/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\344\275\234\344\270\232/s.sql" "b/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\344\275\234\344\270\232/s.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..b95d94b87ee480a53d83f70527e8cd358b622378
--- /dev/null
+++ "b/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\344\275\234\344\270\232/s.sql"
@@ -0,0 +1,38 @@
+--1. 查询出武汉地区所有的员工信息，要求显示部门名称以及员工的详细资料
+SELECT p.*,d.DepartmentName FROM People p
+INNER JOIN Department d ON d.DepartmentId=p.DepartmentId 
+where p.PeopleAddress='武汉'
+--2. 查询出武汉地区所有的员工信息，要求显示部门名称，职级名称以及员工的详细资料
+SELECT p.*,d.DepartmentName,r.RankName FROM People p
+INNER JOIN Department d ON d.DepartmentId=p.DepartmentId 
+inner join Rank r on r.RankId=p.RankId
+where p.PeopleAddress='武汉'
+--3. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资。
+select COUNT(PeopleName) 员工人数,SUM(PeopleSalary) 员工工资总和,AVG(PeopleSalary) 平均工资,max(PeopleSalary) 最高工资,MIN(PeopleSalary) 最低工资 from People p
+INNER JOIN Department d ON d.DepartmentId=p.DepartmentId 
+group by p.DepartmentId
+--4. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select COUNT(PeopleName) 员工人数,SUM(PeopleSalary) 员工工资总和,AVG(PeopleSalary) 平均工资,max(PeopleSalary) 最高工资,MIN(PeopleSalary) 最低工资 from People p
+INNER JOIN Department d ON d.DepartmentId=p.DepartmentId 
+group by p.DepartmentId
+having AVG(PeopleSalary)>10000
+order by AVG(PeopleSalary) desc
+--5. 根据部门名称，然后根据职位名称，分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资
+SELECT * FROM People p
+group by p.DepartmentId
+--6.查询出巨蟹 6.22--7.22 的员工信息
+select * from People
+where month(PeopleBirth) =6 and day(PeopleBirth) between 22 and 30
+or month(PeopleBirth) =7 and day(PeopleBirth) between 1 and 22
+
+--7.查询所有员工信息，添加一列显示属相(鼠,牛,虎,兔,龙,蛇,马,羊,猴,鸡,狗,猪)
+select * from Department
+select * from Rank
+select * ,
+case 
+when year(PeopleBirth)%12 = 0
+then 'zhu'
+when year(PeopleBirth)%12 = 1
+then '技'
+end '123'
+from People
\ No newline at end of file
diff --git "a/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\347\254\224\350\256\260/\346\237\245\350\257\242.sql" "b/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\347\254\224\350\256\260/\346\237\245\350\257\242.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..d39053cc4eb2cf8775a93d07db07c59cb15bb608
--- /dev/null
+++ "b/\351\231\210\347\253\213\346\231\272/\351\231\210\347\253\213\346\231\272/\347\254\224\350\256\260/\346\237\245\350\257\242.sql"
@@ -0,0 +1,86 @@
+--查询公司员工所在城市（不需要重复数据）
+--distinct
+select distinct PeopleAddress from People 
+
+--查询所有员工信息(根据工资排序(order by)，降序排列)
+select * from People order by PeopleSalary desc
+
+
+--查询1980年以后出生的员工信息
+select * from People where year(PeopleBirth)>=1980
+
+
+--查询出巨蟹 6.22--7.22 的员工信息
+
+--查询出和赵云在同一个城市的人
+
+
+select * from People where PeopleAddress=(select peopleAddress from People where PeopleName='赵云')
+
+--查询出电话号码开头138的员工信息,第4位可能是7，可能8 ，最后一个号码是5
+select * from people
+where PeoplePhone like '138[7-9]%5'  --789
+
+--查询出电话号码开头133的员工信息,第4位是2-5之间的数字 ，最后一个号码不是2和3
+select * from people
+where PeoplePhone like '138[2-5]%[^23]'
+
+
+--求出年龄比平均年龄高的人员信息
+--平均年龄：今年-出生年份
+select avg(year(getdate())-year(peoplebirth)) 平均年龄 from People
+
+select * from people where (year(getdate())-year(peoplebirth))>(select avg(year(getdate())-year(peoplebirth)) 平均年龄 from People)
+
+--平均工资
+select avg(PeopleSalary) 平均工资 from People
+
+--保留小数点后2位
+--round(小数,保留位数)
+select round(avg(PeopleSalary),2) 平均工资 from People
+
+--convert 02154.13200 decimal(5,2):保留小数后2位，有效数字总共是5
+
+--convert和cast 可以强制转换数据类型
+select convert(decimal(13,2),avg(PeopleSalary)) 平均工资 from People
+
+--cast
+select cast(avg(PeopleSalary) as decimal(13,2)) 平均工资 from People
+
+
+--根据员工所在地区分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，
+--要求筛选出员工人数至少在2人及以上的记录，并且1985年及以后出身的员工不参与统计。
+--count(*):空值也统计 count(字段)：当前字段的空值不统计
+select count(*) 员工人数,sum(PeopleSalary) 工资总和, max(PeopleSalary) 最高工资,min(PeopleSalary) 最低工资 from People 
+where year(PeopleBirth)<1985
+group by PeopleAddress
+having count(*)>=2
+
+
+--删除数据
+delete from People where PeopleName='蜗牛' 
+
+--删除
+--drop 删除整张表
+--truncate删除整张表，表还在
+
+--根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select count(*) 员工人数, sum(PeopleSalary) 员工工资总和,convert(decimal(15,2),avg(PeopleSalary)) 平均工资 from Department de
+join People po on de.DepartmentId = po.DepartmentId
+group by po.DepartmentId having avg(PeopleSalary)>=10000
+order by 平均工资 desc
+
+create table B(
+	cid int primary key,
+	cname varchar(20)
+)
+
+
+create table A(
+	sid int,
+	sname varchar(10),
+	cid int references B(cid)
+)
+
+select * from A 
+left join B on A.cid=B.cid
\ No newline at end of file