谈谈MySQL的函数问题！
eg：mysql> create database hr;
Query OK, 1 row affected (0.00 sec)
mysql> use hr;
Database changed
mysql> create table employees
-> (
-> employee_id int(11) primary key not null auto_increment,
-> employee_name varchar(50) not null,
-> employee_sex varchar(10) default '男',
-> hire_date datetime not null default current_timestamp,
-> employee_mgr int(11),
-> employee_salary float default 3000,
-> department_id int(11)
-> );
Query OK, 0 rows affected (1.17 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('David Tian','男',10,7500,1);
','女',10,5300,1);
insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Sunshine Ma','女',10,6500,2);
insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) valuesQuery OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Black Xie','男',10,6600,1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Moses Wang','男',10,4300,1);
Query OK, 1 row affected (0.03 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Rena Ruan','女',10,5300,1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Sunshine Ma','女',10,6500,2);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Scott Gao','男',10,9500,2);
Query OK, 1 row affected (0.01 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Warren Si','男',10,7800,2);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Kaishen Yang','男',10,9500,3);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Simon Song','男',10,5500,3);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Brown Guan','男',10,5000,3);
Query OK, 1 row affected (0.01 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Eleven Chen','女',10,3500,2);
employee_salary,department_id) values ('Cherry Zhou','女',10,5500,4);
insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Klause He','男',10,4500,5);
insert into employees(employee_name,employee_sex,eQuery OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Cherry Zhou','女',10,5500,4);
Query OK, 1 row affected (0.01 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Klause He','男',10,4500,5);
mployee_mgr,employee_salary,department_id) values ('Maven Ma','男',10,4500,6);
insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Stephani Wang','女',10,5500,7);
insert into employees(employee_name,eQuery OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Maven Ma','男',10,4500,6);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Stephani Wang','女',10,5500,7);
Query OK, 1 row affected (0.01 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Jerry Guo','男',10,8500,1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Gerardo Garza','男',10,25000,8);
Query OK, 1 row affected (0.01 sec)
mysql> insert into employees(employee_name,employee_sex,employee_mgr,employee_salary,department_id) values ('Derek Wu','男',10,5500,5);
Query OK, 1 row affected (0.03 sec)
mysql> select * from employees;
+-------------+---------------+--------------+---------------------+--------------+-----------------+---------------+
| employee_id | employee_name | employee_sex | hire_date | employee_mgr | employee_salary | department_id |
+-------------+---------------+--------------+---------------------+--------------+-----------------+---------------+
| 1 | David Tian | 男 | 2016-06-03 13:50:28 | 10 | 7500 | 1 |
| 2 | Black Xie | 男 | 2016-06-03 13:50:28 | 10 | 6600 | 1 |
| 3 | Moses Wang | 男 | 2016-06-03 13:50:28 | 10 | 4300 | 1 |
| 4 | Rena Ruan | 女 | 2016-06-03 13:50:28 | 10 | 5300 | 1 |
| 5 | Sunshine Ma | 女 | 2016-06-03 13:50:28 | 10 | 6500 | 2 |
| 6 | Scott Gao | 男 | 2016-06-03 13:50:28 | 10 | 9500 | 2 |
| 7 | Warren Si | 男 | 2016-06-03 13:50:28 | 10 | 7800 | 2 |
| 8 | Kaishen Yang| 男 | 2016-06-03 13:50:28 | 10 | 9500 | 3 |
| 9 | Simon Song | 男 | 2016-06-03 13:50:28 | 10 | 5500 | 3 |
| 10 | Brown Guan | 男 | 2016-06-03 13:50:28 | 10 | 5000 | 3 |
| 11 | Eleven Chen | 女 | 2016-06-03 13:50:28 | 10 | 3500 | 2 |
| 12 | Cherry Zhou | 女 | 2016-06-03 13:50:28 | 10 | 5500 | 4 |
| 13 | Klause He | 男 | 2016-06-03 13:50:28 | 10 | 4500 | 5 |
| 14 | Maven Ma | 男 | 2016-06-03 13:50:28 | 10 | 4500 | 6 |
| 15 | Stephani Wang | 女 | 2016-06-03 13:50:28 | 10 | 5500 | 7 |
| 16 | Jerry Guo | 男 | 2016-06-03 13:50:28 | 10 | 8500 | 1 |
| 17 | Gerardo Garza | 男 | 2016-06-03 13:50:28 | 10 | 25000 | 8 |
| 18 | Derek Wu | 男 | 2016-06-03 13:50:32 | 10 | 5500 | 5 |
+-------------+---------------+--------------+---------------------+--------------+-----------------+---------------+
18 rows in set (0.00 sec)
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