Do we need an employee ID in the employee table?

Yes, an employee table should have a unique employee ID as its primary key. The primary key guarantees that each row can be uniquely identified, which is essential for relational integrity and efficient querying. It also simplifies relationships with other tables (e.g., payroll, benefits) by providing a stable reference point. In a normalized database, the employee ID should be an integer or UUID that is not derived from other attributes, ensuring it remains stable even if other employee details change. Without a primary key, you risk duplicate rows, ambiguous joins, and performance issues. Therefore, including an employee ID is a best practice for data consistency, referential integrity, and query performance.