SELECT avg(price) FROM Lessons AS T1 JOIN Staff AS T2 ON T1.staff_id = T2.staff_id WHERE T2.first_name = "Janessa" AND T2.last_name = "Sawayn";
What is the average price for a lesson taught by Janessa Sawayn?
SELECT avg ( price ) FROM Lessons AS T1 JOIN Staff AS T2 ON T1.staff_id = T2.staff_id WHERE T2.first_name = `` Janessa '' AND T2.last_name = `` Sawayn '' ;
select avg ( price ) from lessons as t1 join staff as t2 on t1 . staff_id = t2 . staff_id where t2 . first_name = value and t2 . last_name = value
What is the average price for a lesson taught by Janessa Sawayn ?