| COLUMN_NAME |
DATA_TYPE |
NULLABLE |
DATA_DEFAULT |
COLUMN_ID |
COMMENTS |
| EMPLOYEE_ID |
NUMBER(6,0) |
No |
null |
1 |
Primary key of employees table. |
| FIRST_NAME |
VARCHAR2(20 BYTE) |
Yes |
null |
2 |
First name of the employee. A not null column. |
| LAST_NAME |
VARCHAR2(25 BYTE) |
No |
null |
3 |
Last name of the employee. A not null column. |
| EMAIL |
VARCHAR2(25 BYTE) |
No |
null |
4 |
Email id of the employee |
| PHONE_NUMBER |
VARCHAR2(20 BYTE) |
Yes |
null |
5 |
Phone number of the employee; includes country code and area code |
| HIRE_DATE |
DATE |
No |
null |
6 |
Date when the employee started on this job. A not null column. |
| JOB_ID |
VARCHAR2(10 BYTE) |
No |
null |
7 |
Current job of the employee; foreign key to job_id column of the
jobs table. A not null column. |
| SALARY |
NUMBER(8,2) |
Yes |
null |
8 |
Monthly salary of the employee. Must be greater
than zero (enforced by constraint emp_salary_min) |
| COMMISSION_PCT |
NUMBER(2,2) |
Yes |
null |
9 |
Commission percentage of the employee; Only employees in sales
department elgible for commission percentage |
| MANAGER_ID |
NUMBER(6,0) |
Yes |
null |
10 |
Manager id of the employee; has same domain as manager_id in
departments table. Foreign key to employee_id column of employees table.
(useful for reflexive joins and CONNECT BY query) |
| DEPARTMENT_ID |
NUMBER(4,0) |
Yes |
null |
11 |
Department id where employee works; foreign key to department_id
column of the departments table |