CREATE TABLE operate_company (id NUMBER, name CLOB, type CLOB, principal_activities CLOB, incorporated_in CLOB, group_equity_shareholding NUMBER)
CREATE TABLE flight (id NUMBER, vehicle_flight_number CLOB, date CLOB, pilot CLOB, velocity NUMBER, altitude NUMBER, airport_id NUMBER, company_id NUMBER)
CREATE TABLE airport (id NUMBER, city CLOB, country CLOB, iata CLOB, icao CLOB, name CLOB)

What is maximum group equity shareholding of the companies?
SELECT MAX(group_equity_shareholding) FROM operate_company
SELECT MAX("group_equity_shareholding") FROM "operate_company"