Answer:
This query uses a JOIN operation to combine the "projects" and "employees" tables based on the "employee_id" foreign key. The WHERE clause filters the results to only include projects where the assigned employee's last name is "Geller" and first name is "Nathan". The SELECT clause specifies which columns to include in the output: "project_id" from the "projects" table, "employee_id" and "last_name" from the "employees" table, and "start_date" from the "projects" table.
SQL Query
SELECT projects.project_id, employees.employee_id, employees.last_name, projects.start_date
FROM projects
JOIN employees ON projects.employee_id = employees.employee_id
WHERE employees.last_name = 'Geller' AND employees.first_name = 'Nathan';