CREATE TABLE fare_basis (fare_basis_code CLOB, booking_class CLOB, class_type CLOB, premium CLOB, economy CLOB, discounted CLOB, night CLOB, season CLOB, basis_days CLOB)
CREATE TABLE ground_service (city_code CLOB, airport_code CLOB, transport_type CLOB, ground_fare NUMBER)
CREATE TABLE month (month_number NUMBER, month_name CLOB)
CREATE TABLE code_description (code VARCHAR2, description CLOB)
CREATE TABLE time_zone (time_zone_code CLOB, time_zone_name CLOB, hours_from_gmt NUMBER)
CREATE TABLE flight_fare (flight_id NUMBER, fare_id NUMBER)
CREATE TABLE aircraft (aircraft_code VARCHAR2, aircraft_description VARCHAR2, manufacturer VARCHAR2, basic_type VARCHAR2, engines NUMBER, propulsion VARCHAR2, wide_body VARCHAR2, wing_span NUMBER, length NUMBER, weight NUMBER, capacity NUMBER, pay_load NUMBER, cruising_speed NUMBER, range_miles NUMBER, pressurized VARCHAR2)
CREATE TABLE equipment_sequence (aircraft_code_sequence VARCHAR2, aircraft_code VARCHAR2)
CREATE TABLE flight_leg (flight_id NUMBER, leg_number NUMBER, leg_flight NUMBER)
CREATE TABLE flight (aircraft_code_sequence CLOB, airline_code VARCHAR2, airline_flight CLOB, arrival_time NUMBER, connections NUMBER, departure_time NUMBER, dual_carrier CLOB, flight_days CLOB, flight_id NUMBER, flight_number NUMBER, from_airport VARCHAR2, meal_code CLOB, stops NUMBER, time_elapsed NUMBER, to_airport VARCHAR2)
CREATE TABLE days (days_code VARCHAR2, day_name VARCHAR2)
CREATE TABLE class_of_service (booking_class VARCHAR2, rank NUMBER, class_description CLOB)
CREATE TABLE fare (fare_id NUMBER, from_airport VARCHAR2, to_airport VARCHAR2, fare_basis_code CLOB, fare_airline CLOB, restriction_code CLOB, one_direction_cost NUMBER, round_trip_cost NUMBER, round_trip_required VARCHAR2)
CREATE TABLE airport_service (city_code VARCHAR2, airport_code VARCHAR2, miles_distant NUMBER, direction VARCHAR2, minutes_distant NUMBER)
CREATE TABLE time_interval (period CLOB, begin_time NUMBER, end_time NUMBER)
CREATE TABLE flight_stop (flight_id NUMBER, stop_number NUMBER, stop_days CLOB, stop_airport CLOB, arrival_time NUMBER, arrival_airline CLOB, arrival_flight_number NUMBER, departure_time NUMBER, departure_airline CLOB, departure_flight_number NUMBER, stop_time NUMBER)
CREATE TABLE dual_carrier (main_airline VARCHAR2, low_flight_number NUMBER, high_flight_number NUMBER, dual_airline VARCHAR2, service_name CLOB)
CREATE TABLE state (state_code CLOB, state_name CLOB, country_name CLOB)
CREATE TABLE restriction (restriction_code CLOB, advance_purchase NUMBER, stopovers CLOB, saturday_stay_required CLOB, minimum_stay NUMBER, maximum_stay NUMBER, application CLOB, no_discounts CLOB)
CREATE TABLE airport (airport_code VARCHAR2, airport_name CLOB, airport_location CLOB, state_code VARCHAR2, country_name VARCHAR2, time_zone_code VARCHAR2, minimum_connect_time NUMBER)
CREATE TABLE compartment_class (compartment VARCHAR2, class_type VARCHAR2)
CREATE TABLE airline (airline_code VARCHAR2, airline_name CLOB, note CLOB)
CREATE TABLE date_day (month_number NUMBER, day_number NUMBER, year NUMBER, day_name VARCHAR2)
CREATE TABLE city (city_code VARCHAR2, city_name VARCHAR2, state_code VARCHAR2, country_name VARCHAR2, time_zone_code VARCHAR2)
CREATE TABLE food_service (meal_code CLOB, meal_number NUMBER, compartment CLOB, meal_description VARCHAR2)

i need a flight from SALT LAKE CITY to EWR airport that arrives on saturday before 1800
SELECT DISTINCT flight_id FROM flight WHERE (((((((arrival_time < 41 OR time_elapsed >= 60) AND departure_time > arrival_time) AND flight_days IN (SELECT DAYSalias1.days_code FROM days AS DAYSalias1 WHERE DAYSalias1.day_name IN (SELECT DATE_DAYalias1.day_name FROM date_day AS DATE_DAYalias1 WHERE DATE_DAYalias1.day_number = 26 AND DATE_DAYalias1.month_number = 7 AND DATE_DAYalias1.year = 1991))) OR (flight_days IN (SELECT DAYSalias0.days_code FROM days AS DAYSalias0 WHERE DAYSalias0.day_name IN (SELECT DATE_DAYalias0.day_name FROM date_day AS DATE_DAYalias0 WHERE DATE_DAYalias0.day_number = 26 AND DATE_DAYalias0.month_number = 7 AND DATE_DAYalias0.year = 1991)) AND NOT ((arrival_time < 41 OR time_elapsed >= 60) AND departure_time > arrival_time))) AND arrival_time < 1800) AND to_airport IN (SELECT AIRPORTalias0.airport_code FROM airport AS AIRPORTalias0 WHERE AIRPORTalias0.airport_code = 'EWR')) AND from_airport IN (SELECT AIRPORT_SERVICEalias0.airport_code FROM airport_service AS AIRPORT_SERVICEalias0 WHERE AIRPORT_SERVICEalias0.city_code IN (SELECT CITYalias0.city_code FROM city AS CITYalias0 WHERE CITYalias0.city_name = 'SALT LAKE CITY')))
WITH "_u_0" AS (SELECT "DATE_DAYalias0"."day_name" FROM "date_day" "DATE_DAYalias0" WHERE "DATE_DAYalias0"."day_number" = 26 AND "DATE_DAYalias0"."month_number" = 7 AND "DATE_DAYalias0"."year" = 1991 GROUP BY "day_name"), "_u_1" AS (SELECT "DAYSalias0"."days_code" FROM "days" "DAYSalias0" LEFT JOIN "_u_0" "_u_0" ON "DAYSalias0"."day_name" = "_u_0"."" WHERE NOT "_u_0"."" IS NULL GROUP BY "days_code"), "_u_10" AS (SELECT "AIRPORTalias0"."airport_code" FROM "airport" "AIRPORTalias0" WHERE "AIRPORTalias0"."airport_code" = 'EWR' GROUP BY "airport_code"), "_u_11" AS (SELECT "CITYalias0"."city_code" FROM "city" "CITYalias0" WHERE "CITYalias0"."city_name" = 'SALT LAKE CITY' GROUP BY "city_code"), "_u_12" AS (SELECT "AIRPORT_SERVICEalias0"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias0" LEFT JOIN "_u_11" "_u_11" ON "AIRPORT_SERVICEalias0"."city_code" = "_u_11"."" WHERE NOT "_u_11"."" IS NULL GROUP BY "airport_code"), "_u_3" AS (SELECT "DAYSalias0"."days_code" FROM "days" "DAYSalias0" LEFT JOIN "_u_0" "_u_2" ON "DAYSalias0"."day_name" = "_u_2"."" WHERE NOT "_u_2"."" IS NULL GROUP BY "days_code"), "_u_5" AS (SELECT "DAYSalias0"."days_code" FROM "days" "DAYSalias0" LEFT JOIN "_u_0" "_u_4" ON "DAYSalias0"."day_name" = "_u_4"."" WHERE NOT "_u_4"."" IS NULL GROUP BY "days_code"), "_u_6" AS (SELECT "DATE_DAYalias1"."day_name" FROM "date_day" "DATE_DAYalias1" WHERE "DATE_DAYalias1"."day_number" = 26 AND "DATE_DAYalias1"."month_number" = 7 AND "DATE_DAYalias1"."year" = 1991 GROUP BY "day_name"), "_u_7" AS (SELECT "DAYSalias1"."days_code" FROM "days" "DAYSalias1" LEFT JOIN "_u_6" "_u_6" ON "DAYSalias1"."day_name" = "_u_6"."" WHERE NOT "_u_6"."" IS NULL GROUP BY "days_code"), "_u_9" AS (SELECT "DAYSalias1"."days_code" FROM "days" "DAYSalias1" LEFT JOIN "_u_6" "_u_8" ON "DAYSalias1"."day_name" = "_u_8"."" WHERE NOT "_u_8"."" IS NULL GROUP BY "days_code") SELECT DISTINCT "flight_id" FROM "flight" LEFT JOIN "_u_1" "_u_1" ON "_u_1"."" = "flight_days" LEFT JOIN "_u_10" "_u_10" ON "_u_10"."" = "to_airport" LEFT JOIN "_u_12" "_u_12" ON "_u_12"."" = "from_airport" LEFT JOIN "_u_3" "_u_3" ON "_u_3"."" = "flight_days" LEFT JOIN "_u_5" "_u_5" ON "_u_5"."" = "flight_days" LEFT JOIN "_u_7" "_u_7" ON "_u_7"."" = "flight_days" LEFT JOIN "_u_9" "_u_9" ON "_u_9"."" = "flight_days" WHERE ("arrival_time" < "departure_time" OR NOT "_u_3"."" IS NULL) AND "arrival_time" < 1800 AND ("arrival_time" < 41 OR "time_elapsed" >= 60 OR NOT "_u_1"."" IS NULL) AND ("arrival_time" >= "departure_time" OR ("arrival_time" >= 41 AND "time_elapsed" < 60) OR NOT "_u_9"."" IS NULL) AND NOT "_u_10"."" IS NULL AND NOT "_u_12"."" IS NULL AND (NOT "_u_5"."" IS NULL OR NOT "_u_7"."" IS NULL)