MySQL数据库DQL实验

最新推荐文章于 2025-06-12 17:36:07 发布

xxc_my

最新推荐文章于 2025-06-12 17:36:07 发布

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本文链接：https://blog.youkuaiyun.com/2201_75406597/article/details/145185953

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实验题目：

1、创建一个mydb8_worker库

2、创建一张t_worker表

3、插入以下数据

4、进行以下查询操作

实验步骤：

1、创建数据库、创建表：

 create database mydb8_worker;
Query OK, 1 row affected (0.01 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mydb2_stuinfo      |
| mydb3_employee     |
| mydb4_product      |
| mydb5_sales        |
| mydb6_product      |
| mydb7_openlab      |
| mydb8_worker       |
| mydb_temp1         |
| mydbx_temp3        |
| mysql              |
| mysql_test         |
| performance_schema |
| sys                |
| temp1              |
+--------------------+
15 rows in set (0.00 sec)

mysql> use mydb8_worker;
Database changed
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_date date 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',
    -> name varchar(20) not null comment '姓名',
    -> borth_date date not null comment '出生日期');
Query OK, 0 rows affected, 3 warnings (0.03 sec)

mysql>
mysql>
mysql> desc t_worker;
+---------------+-------------+------+-----+---------+-------+
| Field         | Type        | Null | Key | Default | Extra |
+---------------+-------------+------+-----+---------+-------+
| department_id | int         | NO   |     | NULL    |       |
| worker_id     | int         | NO   | PRI | NULL    |       |
| worker_date   | date        | NO   |     | NULL    |       |
| wages         | float(8,2)  | NO   |     | NULL    |       |
| politics      | varchar(10) | NO   |     | 群众    |       |
| name          | varchar(20) | NO   |     | NULL    |       |
| borth_date    | date        | NO   |     | NULL    |       |
+---------------+-------------+------+-----+---------+-------+
7 rows in set (0.00 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 (0.01 sec)

mysql> insert into t_worker values (102,1002,'2019-2-6',5200.00,'团员','李名博','1997-2-8');
Query OK, 1 row affected (0.01 sec)

mysql> insert into t_worker values (103,1003,'2008-1-4',10500.00,'党员','王博涵','1983-6-8');
Query OK, 1 row affected (0.01 sec)

mysql> insert into t_worker values (104,1004,'2016-10-10',5500.00,'群众','赵小军','1994-9-5');
Query OK, 1 row affected (0.01 sec)

mysql> insert into t_worker values (105,1005,'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 (106,1006,'2019-5-5',5500.00,'党员','孙菲菲','1996-9-2');
Query OK, 1 row affected (0.01 sec)
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)

3、查询数据：

(1)

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     | 张海燕 | 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）

mysql> select distinct department_id from t_worker;
+---------------+
| department_id |
+---------------+
|           101 |
|           102 |
|           103 |
+---------------+
3 rows in set (0.00 sec)

(3)

mysql> select count(worker_id) '职工人数' from t_worker;
+----------+
| 职工人数 |
+----------+
|        6 |
+----------+
1 row in set (0.00 sec)

(4)

mysql>  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)

mysql>  select round(avg(wages),2) '平均工资', sum(wages) '总工资' from t_worker;
+----------+----------+
| 平均工资 | 总工资   |
+----------+----------+
|  7166.67 | 43000.00 |
+----------+----------+
1 row in set (0.00 sec)

(6)

mysql> create table t_workdate select worker_id, name, worker_date from t_worker;
Query OK, 6 rows affected (0.03 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> select * from t_workdate;
+-----------+--------+-------------+
| 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)

mysql> select year(now())- year( borth_date) '年龄' from t_worker where politics='党员';
+------+
| 年龄 |
+------+
|   42 |
|   33 |
|   29 |
+------+
3 rows in set (0.00 sec)

(8)

mysql> 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)

mysql> select name from t_worker where name  like '孙%' or name like '李%';
+--------+
| name   |
+--------+
| 李名博 |
| 孙菲菲 |
+--------+
2 rows in set (0.00 sec)

(10)

mysql> select  worker_id,name from t_worker where  department_id in(102,103)  and politics!='党员';
+-----------+--------+
| worker_id | name   |
+-----------+--------+
|      1004 | 赵小军 |
+-----------+--------+
1 row in set (0.00 sec)

(11)

mysql> 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     | 张海燕 | 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)

mysql> 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 | 张海燕 |
+-----------+--------+
3 rows in set (0.00 sec)

(13)

mysql> select department_id '部门号',count(worker_id) '党员人数' from t_worker where politics='党员' group by department_id;
+--------+----------+
| 部门号 | 党员人数 |
+--------+----------+
|    102 |        2 |
|    103 |        1 |
+--------+----------+
2 rows in set (0.00 sec)

(14)

mysql> select department_id '部门号', sum( wages) '部门工资总和', round(avg( wages),2) '部门平均工资' from  t_worker group by  department_id;
+--------+--------------+--------------+
| 部门号 | 部门工资总和 | 部门平均工资 |
+--------+--------------+--------------+
|    101 |     12700.00 |         6350 |
|    102 |     24800.00 |      8266.67 |
|    103 |      5500.00 |         5500 |
+--------+--------------+--------------+
3 rows in set (0.00 sec)

(15)

mysql> select department_id '部门号', count(worker_id) '人数' from t_worker group by department_id having count(worker_id)>=3;
+--------+------+
| 部门号 | 人数 |
+--------+------+
|    102 |    3 |
+--------+------+
1 row in set (0.00 sec)