day06 作业---技能题7

1.创建db_test数据库

create database db_test character set utf8;

2.创建yuangong表

create table yuangong(
empno int not null primary key,
ename varchar(50),
job varchar(50),
mgr int,
hiredate date,
sal decimal(7,2),
COMM decimal(7,2),
deptno int
)
desc yuangong;

3.向yuangong表中添加记录

insert into yuangong value 
(1001,'甘宁','文员',1013,'2000-12-17',8000.00,null,20),
(1002,'黛绮丝','销售员',1006,'2001-02-20',16000.00,3000.00,30),
(1003,'殷正天','销售员',1006,'2001-02-22',12500.00,5000.00,30),
(1004,'刘备','经理',1009,'2001-04-02',29750.00,null,20),
(1005,'谢逊','销售员',1006,'2001-09-28',12500.00,14000.00,30),
(1006,'关羽','经理',1009,'2001-05-01',28500.00,null,30),
(1007,'张飞','经理',1009,'2001-09-01',24500.00,null,10),
(1008,'诸葛亮','分析师',1004,'2007-04-19',30000.00,null,20),
(1009,'曾阿牛','董事长',null,'2001-11-17',50000.00,null,10),
(1010,"韦一笑","销售员",1006,"2001-09-08",15000.00,0.00,30),
(1011,"周泰","文员",1008,"2007-05-23",11000.00,null,20),
(1012,"程普","文员",1006,"2001-12-03",9500.00,null,30),
(1013,"庞统","分析师",1004,"2001-12-03",30000.00,null,20),
(1014,"黄盖","文员",1007,"2002-01-23",13000.00,null,10),
(1015,"张三","文员",1007,"2002-01-23",53000.00,null,50)

使用sql语句完成以下功能：

(1)查询表中所有内容

select * from student;

(2)修改表名为”emp”

alter table yuangong rename emp;

(3)修改ename字段的类型为varchar(40)

alter table emp MODIFY COLUMN ename varchar(40);
desc emp;

(4)删除表中empno是1014并且ename是黄盖的员工信息

delete from emp where empno=1014 and ename='黄盖';
select * from emp;

(5)查询表中empno字段的值是1007，1009或1011员工的所有记录

select * from emp where empno in(1007,1009,1011);

(6)查询表中所有job字段是文员并且姓名是张三的员工的所有信息

select * from emp where job='文员' and ename='张三';

(7)查询表中在2001年以后入职的员工信息

select * from emp where hiredate >'2001-12-31';