## Operating_System_Knowledge

ID | OS_Name
--- | ---
1 | Windows
2 | Linux

## IT_Support_Technician

ID | Name | Contact_Email | Phone_Number | Hire_Date | Operating_System_ID
--- | --- | --- | --- | --- | ---
|  |  |  |  | (→ Operating_System_Knowledge.ID)
1 | John Doe | john@example.com | +1 (123) 456-7890 | 2020-01-01 | 1
2 | Jane Smith | jane@example.com | +1 (123) 456-7890 | 2020-01-01 | 2

## Network_Administrator

ID | Name | Contact_Email | Phone_Number | Hire_Date | Operating_System_ID
--- | --- | --- | --- | --- | ---
|  |  |  |  | (→ Operating_System_Knowledge.ID)
1 | Mike Johnson | mike@example.com | +1 (123) 456-7890 | 2020-01-01 | 1
2 | Emily Davis | emily@example.com | +1 (123) 456-7890 | 2020-01-01 | 2

## Employee

ID | First_Name | Last_Name | Position | Salary | Joining_Date
--- | --- | --- | --- | --- | ---
1 | Alice | Smith | Software Engineer | 75000 | 2019-06-01
2 | Bob | Williams | Data Analyst | 65000 | 2019-05-01
3 | Carol | Johnson | Product Manager | 85000 | 2019-07-01
4 | David | Brown | UI/UX Designer | 60000 | 2019-08-01
5 | Eve | Jones | QA Tester | 55000 | 2019-09-01