企业官网建设流程全解析

要求：

1.建库建表

（1）建库

create database mydb8_worker;

Query OK, 1 row affected (0.01 sec)

mysql> use mydb8_worker;

Database changed

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mydb1_test |

| mydb2_stuinfo |

| mydb3_employee |

| mydb4_product |

| mydb5_sales |

| mydb6_product |

| mydb7_openlab |

| mydb8_worker |

| mysql |

| performance_schema |

| sys |

| temp1 |

+--------------------+

13 rows in set (0.00 sec)

2).建表

mysql> create table t_worker(department_id int(11) not null comment '部门号', worker_id int(11) primary key not null comment '职工号', worker_datedate not null comment '工作时间', wages float(8,2) not null comment '工资',, politics varchar(10) not null default '群众' comment '政治面貌', namevarchar(20) not null comment '姓名', borth_date date not null comment '出生日期');

Query OK, 0 rows affected, 3 warnings (0.02 sec)

2.插入数据

mysql> insert into t_worker values (101,1001,'2015-5-4',7500.00,'群众','张春燕','1990-7-1');

Query OK, 1 row affected (0.00 sec)

mysql> insert into t_worker values (101,1002,'2019-2-6',5200.00,'团员','李名博','1997-2--8');

Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into t_worker values (102,1003,'2008-1-4',10500.00,'党员','王博涵','1983-6-8');

Query OK, 1 row affected (0.00 sec)

mysql> insert into t_worker values (102,1004,'2016-10-10',5500.00,'群众','赵小军','1994-9-5');

Query OK, 1 row affected (0.00 sec)

mysql> insert into t_worker values (102,1005,'2014-4-1',8800.00,'党员','钱有财','1992-12-30');

Query OK, 1 row affected (0.00 sec)

mysql> insert into t_worker values (103,1006,'2019-5-5',5500.00,'党员','孙菲菲','1996-9-2');

Query OK, 1 row affected (0.01 sec)

3.完成查询命令及截图

1).显示所有职工的基本信息。

mysql> select * from t_worker;

+---------------+-----------+-------------+----------+----------+-----------+------------+

| department_id | worker_id | worker_date | wages | politics | name | borth_date |

+---------------+-----------+-------------+----------+----------+-----------+------------+

| 101 | 1001 | 2015-05-04 | 7500.00 | 群众 | 张春燕 | 1990-07-01 |

| 101 | 1002 | 2019-02-06 | 5200.00 | 团员 | 李名博 | 1997-02-08 |

| 102 | 1003 | 2008-01-04 | 10500.00 | 党员 | 王博涵 | 1983-06-08 |

| 102 | 1004 | 2016-10-10 | 5500.00 | 群众 | 赵小军 | 1994-09-05 |

| 102 | 1005 | 2014-04-01 | 8800.00 | 党员 | 钱有财 | 1992-12-30 |

| 103 | 1006 | 2019-05-05 | 5500.00 | 党员 | 孙菲菲 | 1996-09-02 |

+---------------+-----------+-------------+----------+----------+-----------+------------+

6 rows in set (0.00 sec)

2).查询所有职工所属部门的部门号，不显示重复的部门号。

范樱>select distinct department_id from t_worker;

+---------------+

| department_id |

+---------------+

| 101 |

| 102 |

| 103 |

+---------------+

3).求出所有职工的人数。

范樱>select count(worker_id) '职工人数' from t_worker;

+--------------+

| 职工人数 |

+--------------+

| 6 |

+--------------+

1 row in set (0.01 sec)

4).列出最高工和最低工资。

范樱>select max(wages) '最高工资' , min(wages) '最低工资' from t_worker;

+--------------+--------------+

| 最高工资 | 最低工资 |

+--------------+--------------+

| 10500.00 | 5200.00 |

+--------------+--------------+

1 row in set (0.00 sec)

5).列出职工的平均工资和总工资。

范樱>select avg(wages) '平均工资' , sum(wages) '总工资' from t_worker;

+--------------+-----------+

| 平均工资 | 总工资 |

+--------------+-----------+

| 7166.666667 | 43000.00 |

+--------------+-----------+

1 row in set (0.00 sec)

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。

范樱>create table t_workedate select worker_id,name,worker_date from t_worker;

Query OK, 6 rows affected (0.03 sec)

Records: 6 Duplicates: 0 Warnings: 0

范樱>select * from t_workedate;

+-----------+-----------+-------------+

| worker_id | name | worker_date |

+-----------+-----------+-------------+

| 1001 | 张春燕 | 2015-05-04 |

| 1002 | 李名博 | 2019-02-06 |

| 1003 | 王博涵 | 2008-01-04 |

| 1004 | 赵小军 | 2016-10-10 |

| 1005 | 钱有财 | 2014-04-01 |

| 1006 | 孙菲菲 | 2019-05-05 |

+-----------+-----------+-------------+

6 rows in set (0.00 sec)

7).显示所有党员的年龄

范樱>select politics '政治面貌' , year(now())-year(borth_date) '年龄' from t_worker where

+--------------+--------+

| 政治面貌 | 年龄 |

+--------------+--------+

| 党员 | 43 |

| 党员 | 34 |

| 党员 | 30 |

+--------------+--------+

3 rows in set (0.00 sec)

8).列出工资在4000一8000之间的所有职工姓名。

范樱>select name from t_worker where wages>=4000 and wages<=8000;

+-----------+

| name |

+-----------+

| 张春燕 |

| 李名博 |

| 赵小军 |

| 孙菲菲 |

+-----------+

4 rows in set (0.00 sec)

9).列出所有孙姓和李姓的职工姓名。

范樱>select name from t_worker where name like '孙%' or name like '李%';

+-----------+

| name |

+-----------+

| 李名博 |

| 孙菲菲 |

+-----------+

10).列出所有部门号为102和103且不是党员的职工号、姓名。

范樱>select worker_id,name from t_worker where (department_id=102 or department_id=103) a

+-----------+-----------+

| worker_id | name |

+-----------+-----------+

| 1004 | 赵小军 |

+-----------+-----------+

1 row in set (0.00 sec)

11).将职工表t_worker中的职工按出生的先后顺序排序。

范樱>select * from t_worker order by borth_date;

+---------------+-----------+-------------+----------+----------+-----------+------------

| department_id | worker_id | worker_date | wages | politics | name | borth_date

+---------------+-----------+-------------+----------+----------+-----------+------------

| 102 | 1003 | 2008-01-04 | 10500.00 | 党员 | 王博涵 | 1983-06-08

| 101 | 1001 | 2015-05-04 | 7500.00 | 群众 | 张春燕 | 1990-07-01

| 102 | 1005 | 2014-04-01 | 8800.00 | 党员 | 钱有财 | 1992-12-30

| 102 | 1004 | 2016-10-10 | 5500.00 | 群众 | 赵小军 | 1994-09-05

| 103 | 1006 | 2019-05-05 | 5500.00 | 党员 | 孙菲菲 | 1996-09-02

| 101 | 1002 | 2019-02-06 | 5200.00 | 团员 | 李名博 | 1997-02-08

+---------------+-----------+-------------+----------+----------+-----------+------------

6 rows in set (0.00 sec)

12).显示工资最高的前3名职工的职工号和姓名。

范樱>select worker_id,name from t_worker order by wages desc limit 3;

+-----------+-----------+

| worker_id | name |

+-----------+-----------+

| 1003 | 王博涵 |

| 1005 | 钱有财 |

| 1001 | 张春燕 |

+-----------+-----------+

3 rows in set (0.00 sec)

13).求出各部门党员的人数。

范樱>select department_id '部门编号' , count(worker_id) '人数' from t_worker where politics='党员'

-> group by department_id;

+--------------+--------+

| 部门编号 | 人数 |

+--------------+--------+

| 102 | 2 |

| 103 | 1 |

+--------------+--------+

2 rows in set (0.00 sec)

14).统计各部门的工资和平均工资并保留2位小数

范樱>select department_id '部门编号' , sum(wages) '工资和值' , round(avg(wages)) '平均工资'

-> from t_worker

-> group by 1;

+--------------+--------------+--------------+

| 部门编号 | 工资和值 | 平均工资 |

+--------------+--------------+--------------+

| 101 | 12700.00 | 6350 |

| 102 | 24800.00 | 8267 |

| 103 | 5500.00 | 5500 |

+--------------+--------------+--------------+

3 rows in set (0.00 sec)

(15).列出总人数大于等于3的部门号和总人数。

范樱>select department_id '部门编号' , count(worker_id) '部门人数'

-> from t_worker

-> group by 1 having count(worker_id)>=3;

+--------------+--------------+

| 部门编号 | 部门人数 |

+--------------+--------------+

| 102 | 3 |

+--------------+--------------+

1 row in set (0.00 sec)