Generating Surrogate Keys

Problem

The business key for employees is a social security number, which you cannot legally use as the primary key in your data warehouse. You decide to generate a meaningless unique string for every row. Select first_name and generate a UUID for each row using the uuid() function (supported by DuckDB).

Database Schema

Table: employees

• employee_id (INT): Unique identifier for the employee.
• first_name (VARCHAR): First name of the employee.
• last_name (VARCHAR): Last name of the employee.
• salary (INT): Employee's salary.
• department_id (INT): Foreign key referencing the department.
• manager_id (INT): Foreign key referencing the manager (another employee).
• hire_date (DATE): Date the employee was hired.

Table: departments

• department_id (INT): Unique identifier for the department.
• department_name (VARCHAR): Name of the department.

Try It

Hint

Solution