CREATE TABLE repair_assignment (technician_id DECIMAL, repair_id DECIMAL, machine_id DECIMAL)
CREATE TABLE machine (machine_id DECIMAL, making_year DECIMAL, class TEXT, team TEXT, machine_series TEXT, value_points DECIMAL, quality_rank DECIMAL)
CREATE TABLE repair (repair_id DECIMAL, name TEXT, launch_date TEXT, notes TEXT)
CREATE TABLE technician (technician_id DECIMAL, name TEXT, team TEXT, starting_year DECIMAL, age DECIMAL)

What are the starting years shared by the technicians from the team 'CLE' or 'CWS'?
SELECT starting_year FROM technician WHERE team = "CLE" INTERSECT SELECT starting_year FROM technician WHERE team = "CWS"
SELECT "starting_year" FROM "technician" WHERE "CLE" = "team" INTERSECT SELECT "starting_year" FROM "technician" WHERE "CWS" = "team"