MySQL数据库，创建表及其插入数据和查询数据

 首先，由上图创建表

mysql> create table worker(
    -> dept_id int(11) not null,
    -> emp_id int (11) not null,
    -> work_time date not null,
    -> salary float(8,2) not null,
    -> poli_face varchar(10) not null default '群众',
    -> name varchar(20) not null,
    -> birth date not null,
    -> primary key(emp_id)
    -> )engine=innodb default charset=utf8 row_format=dynamic;
Query OK, 0 rows affected, 4 warnings (0.03 sec)

然后，向表内插入数据

mysql> insert into worker values(101,1001,'2015-5-4', 3500.00,'群众','张三','1990-7-1');
Query OK, 1 row affected (0.00 sec)

mysql> insert into worker values(101,1002,'2017-2-6', 3200.00,'团员','李四','1990-2-8');
Query OK, 1 row affected (0.01 sec)

mysql> insert into worker values(102,1003,'2011-2-4',8500.00,'党员','王亮','1983-6-8');
Query OK, 1 row affected (0.01 sec)

mysql> insert into worker values(102,1004,'2016-10-10',5500.00,'群众','赵六','1994-9-5');
Query OK, 1 row affected (0.00 sec)

mysql> insert into worker values(102,1005,'2014-4-1',4800.00,'党员','钱七','1992-12-30');
Query OK, 1 row affected (0.00 sec)

mysql> insert into worker values(102,1006,'2017-5-5',4500.00,'党员','孙八','1996-9-2');
Query OK, 1 row affected (0.00 sec)

 1，显示所有职工的基本信息

 2，查询所有职工所属部门的部门号，不显示重复的部门号

 3，求出所有职工的人数

 4，列入最高工和最低工资

 5，列入职工的平均工资和总工资

 6，创建一个只有职工号，姓名和参加工作的新表，名为工作日期表

mysql> create table workdate select emp_id,name from worker;
Query OK, 6 rows affected (0.02 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> select *from workdate;
+--------+--------+
| emp_id | name   |
+--------+--------+
|   1001 | 张三   |
|   1002 | 李四   |
|   1003 | 王亮   |
|   1004 | 赵六   |
|   1005 | 钱七   |
|   1006 | 孙八   |
+--------+--------+
6 rows in set (0.00 sec)

7，显示所有女职工的年龄（要给表中增加性别和年龄，然后给每人插入年龄和性别）

mysql> alter table worker add age tinyint default 18;
Query OK, 0 rows affected (0.03 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> alter table worker add gender char(1) check(gender in ('F','M'));
Query OK, 6 rows affected (0.04 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> update worker set age=19,gender='F' where name='张三';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update worker set age=20,gender='F' where name='李四';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update worker set age=21,gender='M' where name='王亮';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update worker set gender='M' where name='赵六';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update worker set gender='M' where name='钱七';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update worker set gender='M' where name='孙八';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

查看表内容

 最后差询女职工的年龄

 8,列出所有姓刘的职工的职工号，姓名和出生日期

9，列出1960年以前出生的职工的姓名，参加工作日期

Empty set (0.00 sec)  没有符合条件的职工，所以为空

10，列出工资在1000-2000之间的所有职工姓名

 11，列出所有姓陈和姓李的职工姓名

 12，列出所有部门号为2和3的职工号，姓名，党员

 13，将职工表worker中的职工按先后顺序排序

 14，显示工资最高的前3名职工的职工号和姓名

 15，求出个部门党员的人数

16，统计个部门的工资和平均工资

 

 

17，统计总人数大于4的部门号和总人数