-- Database schema
| Addresses : address_id [ INT ] primary_key , line_1_number_building [ TEXT ] , city [ TEXT ] , zip_postcode [ TEXT ] , state_province_county [ TEXT ] , country [ TEXT ] | Staff : staff_id [ INT ] primary_key , staff_address_id [ INT ] Staff.staff_address_id = Addresses.address_id , nickname [ TEXT ] , first_name [ TEXT ] , middle_name [ TEXT ] , last_name [ TEXT ] , date_of_birth [ TEXT ] , date_joined_staff [ TEXT ] , date_left_staff [ TEXT ] | Vehicles : vehicle_id [ INT ] primary_key , vehicle_details [ TEXT ] | Customers : customer_id [ INT ] primary_key , customer_address_id [ INT ] Customers.customer_address_id = Addresses.address_id , customer_status_code [ TEXT ] , date_became_customer [ TEXT ] , date_of_birth [ TEXT ] , first_name [ TEXT ] , last_name [ TEXT ] , amount_outstanding [ INT ] , email_address [ TEXT ] , phone_number [ TEXT ] , cell_mobile_phone_number [ TEXT ] | Customer_Payments : customer_id [ INT ] primary_key Customer_Payments.customer_id = Customers.customer_id , datetime_payment [ TEXT ] , payment_method_code [ TEXT ] , amount_payment [ INT ] | Lessons : lesson_id [ INT ] primary_key , customer_id [ INT ] Lessons.customer_id = Customers.customer_id , lesson_status_code [ TEXT ] , staff_id [ INT ] Lessons.staff_id = Staff.staff_id , vehicle_id [ INT ] Lessons.vehicle_id = Vehicles.vehicle_id , lesson_date [ TEXT ] , lesson_time [ TEXT ] , price [ INT ] |
-- -- What is the nickname of the employee named Janessa Sawayn?

SELECT nickname FROM Staff WHERE first_name = "Janessa" AND last_name = "Sawayn";