CREATE TABLE airports (apid NUMBER, name CLOB, city CLOB, country CLOB, x NUMBER, y NUMBER, elevation NUMBER, iata CLOB, icao CLOB)
CREATE TABLE airlines (alid NUMBER, name CLOB, iata CLOB, icao CLOB, callsign CLOB, country CLOB, active CLOB)
CREATE TABLE routes (rid NUMBER, dst_apid NUMBER, dst_ap CLOB, src_apid NUMBER, src_ap CLOB, alid NUMBER, airline CLOB, codeshare CLOB)

Find the name of airports whose altitude is between -50 and 50.
SELECT name FROM airports WHERE elevation BETWEEN -50 AND 50
SELECT "name" FROM "airports" WHERE "elevation" <= 50 AND "elevation" >= -50