建表并插入数据:
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;
mysql> insert into worker values(101,1001,'2015-5-4',3500.00,'群众','张三','1990-7-1');
mysql> insert into worker values(101,1002,'2017-2-6',3200.00,'团员','李四','1997-2-8');
mysql> insert into worker values(102,1003,'2011-2-4',8500.00,'党员','王亮','1983-6-8');
mysql> insert into worker values(102,1004,'2016-10-10',5500.00,'群众','赵六','1994-9-5');
mysql> insert into worker values(102,1005,'2014-4-1',4800.00,'党员','钱七','1992-12-30');
mysql> insert into worker values(102,1006,'2017-5-5',4500.00,'党员','孙八','1996-9-2');
1、显示所有职工的基本信息:
mysql> select *from worker;
2、查询所有职工所属部门的部门号,不显示重复的部门号。
mysql> select distinct dept_id from worker;
3、求出所有职工的人数。
mysql> select count(name) from worker;
4、列出最高工和最低工资。
mysql> select max(salary) as '最高工资',min(salary) as '最低工资' from worker;
5、列出职工的平均工资和总工资。
mysql> select avg(salary) as '平均工资',sum(salary) as '平均工资' from worker;
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。
7、显示所有女职工的年龄。(worker表中先增加年龄性别属性,再将数据插入,然后查询。)
mysql> alter table worker add age tinyint default 18;
Query OK, 0 rows affected (0.02 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 (0.03 sec)
Records: 6 Duplicates: 0 Warnings: 0
mysql> update worker set age=43,gender='M' where name='张三';
Query OK, 1 row affected (0.05 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update worker set age=39,gender='F' where name='李四';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update worker set age=47,gender='F' where name='王亮';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update worker set age=37,gender='M' where name='赵六';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update worker set age=36,gender='F' where name='钱七';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update worker set age=30,gender='F' where name='孙八';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
8、列出所有姓刘的职工的职工号、姓名和出生日期。
mysql> select emp_id,name,birth from worker where name='刘%';
Empty set (0.00 sec)
9、列出1960年以前出生的职工的姓名、参加工作日期。
mysql> select name,work_time from worker where birth < '1960-1-1';
Empty set (0.00 sec)
10、列出工资在1000一2000之间的所有职工姓名。
mysql> select name from worker where salary between 1000 and 2000;
Empty set (0.01 sec)
11、列出所有陈姓和李姓的职工姓名。
mysql> select name from worker where name like '李%' or name like '陈%';
+--------+
| name |
+--------+
| 李四 |
+--------+
1 row in set (0.00 sec)
12、列出所有部门号为2和3的职工号、姓名、党员否。
mysql> select emp_id,name from worker where poli_face != '党员' and dept_id in (102,103);
+--------+--------+
| emp_id | name |
+--------+--------+
| 1004 | 赵六 |
+--------+--------+
1 row in set (0.01 sec)
13、将职工表worker中的职工按出生的先后顺序排序。
mysql> select name,birth from worker order by(birth);
+--------+------------+
| name | birth |
+--------+------------+
| 王亮 | 1983-06-08 |
| 张三 | 1990-07-01 |
| 钱七 | 1992-12-30 |
| 赵六 | 1994-09-05 |
| 孙八 | 1996-09-02 |
| 李四 | 1997-02-08 |
+--------+------------+
6 rows in set (0.00 sec)
14、显示工资最高的前3名职工的职工号和姓名。
mysql> select emp_id,name from worker order by(salary) desc limit 0,3;
+--------+--------+
| emp_id | name |
+--------+--------+
| 1003 | 王亮 |
| 1004 | 赵六 |
| 1005 | 钱七 |
+--------+--------+
3 rows in set (0.00 sec)
15、求出各部门党员的人数。
mysql> select dept_id ,count(name) from worker where poli_face='党员' group by(dept_id);
+---------+-------------+
| dept_id | count(name) |
+---------+-------------+
| 102 | 3 |
+---------+-------------+
1 row in set (0.01 sec)
16、统计各部门的工资和平均工资。
mysql> select dept_id,sum(salary),avg(salary) from worker group by(dept_id);
+---------+-------------+-------------+
| dept_id | sum(salary) | avg(salary) |
+---------+-------------+-------------+
| 101 | 6700.00 | 3350.000000 |
| 102 | 23300.00 | 5825.000000 |
+---------+-------------+-------------+
2 rows in set (0.00 sec)
17、列出总人数大于4的部门号和总人数。
mysql> select dept_id,count(name) from worker group by(dept_id) having count(name) > 4;
Empty set (0.00 sec)