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diff --git "a/30\345\220\264\350\266\205/8.30\344\275\234\344\270\232.md" "b/30\345\220\264\350\266\205/8.30\344\275\234\344\270\232.md"
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+```
+--1. 查询所有行所有列
+select * from People
+--2. 指定列查询（姓名，性别，月薪，电话）
+select PeopleName,PeopleSex,PeopleSalary,PeoplePhone from People
+--3. 指定列查询,并自定义中文列名（姓名，性别，月薪，电话）
+select PeopleName 姓名,PeopleSex 性别,PeopleSalary 月薪,PeoplePhone 电话 from People
+--4. 查询公司员工所在城市（不需要重复数据）
+select distinct PeopleAddress from People
+--5. 假设工资普调10%，查询原始工资和调整后的工资，显示（姓名，性别，月薪，加薪后的月薪）（添加列查询）。
+select PeopleName 姓名,PeopleSex 性别,PeopleSalary 月薪,PeopleSalary*1.1 加薪后的月薪 from People
+
+--1. 根据指定列（姓名，性别，月薪，电话）查询性别为女的员工信息,并自定义中文列名
+select PeopleName 姓名,PeopleSex 性别 ,PeopleSalary 月薪 ,PeoplePhone 电话 from People
+where PeopleSex='女'
+--2. 查询月薪大于等于10000 的员工信息( 单条件 )
+select * from People
+where PeopleSalary >10000
+--3. 查询月薪大于等于10000 的女员工信息(多条件)
+select * from People
+where PeopleSex='女' and PeopleSalary >10000
+--4. 显示出出身年月在1980-1-1之后，而且月薪大于等于10000的女员工信息。
+select * from People
+where PeopleSex='女' and PeopleSalary >10000 and PeopleBirth>1980-1-1
+--5. 显示出月薪大于等于15000 的员工,或者月薪大于等于8000的女员工信息。
+select * from People 
+where PeopleSalary >= 15000 or（ PeopleSalary >8000 and PeopleSex='女'） 
+--6. 查询月薪在10000-20000 之间员工信息( 多条件 )
+select * from people
+where PeopleSalary between 10000 and  20000
+--7. 查询出地址在北京或者上海的员工信息
+select * from People 
+where PeopleAddress ='北京' or PeopleAddress='上海'
+--8. 查询所有员工信息(根据工资排序，降序排列)
+select * from People
+order by PeopleSalary desc
+--9. 显示所有的员工信息，按照名字的长度进行倒序排列
+select * from People
+order by len(PeopleName) desc
+--10. 查询工资最高的5个人的信息
+select top 5 * from People
+order by PeopleSalary desc
+--11. 查询工资最高的10%的员工信息
+
+--12. 查询出地址没有填写的员工信息
+select * from People
+where PeopleAddress is null
+--13. 查询出地址已经填写的员工信息
+select * from People
+where PeopleAddress is not null
+--14. 查询所有的80后员工信息
+select * from People
+where PeopleBirth>1980-1-1
+--15. 查询年龄在30-40 之间，并且工资在15000-30000 之间的员工信息
+select * from people 
+where (YEAR(GETDATE())-YEAR(PeopleBirth)) between 30 and 40
+--16. 查询出巨蟹 6.22--7.22 的员工信息
+select * from People 
+where (MONTH(PeopleBirth)=6 and day(PeopleBirth)>=22)or (month(PeopleBirth)=7 and day(PeopleBirth)<=22)
+--17. 查询工资比赵云高的人
+select * from People 
+where PeopleSalary > (select PeopleSalary from People where PeopleName = '赵云')
+--18. 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')
+--19. 查询出生肖为鼠的人员信息
+select * from people 
+where (year(PeopleBirth)%12)-3 =1
+--20. 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)
+```
\ No newline at end of file