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 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 city (city_code VARCHAR2, city_name VARCHAR2, state_code VARCHAR2, country_name VARCHAR2, time_zone_code VARCHAR2)
CREATE TABLE flight_leg (flight_id NUMBER, leg_number NUMBER, leg_flight NUMBER)
CREATE TABLE code_description (code VARCHAR2, description CLOB)
CREATE TABLE days (days_code VARCHAR2, day_name VARCHAR2)
CREATE TABLE compartment_class (compartment VARCHAR2, class_type VARCHAR2)
CREATE TABLE class_of_service (booking_class VARCHAR2, rank NUMBER, class_description CLOB)
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 airport_service (city_code VARCHAR2, airport_code VARCHAR2, miles_distant NUMBER, direction VARCHAR2, minutes_distant NUMBER)
CREATE TABLE time_zone (time_zone_code CLOB, time_zone_name CLOB, hours_from_gmt NUMBER)
CREATE TABLE airline (airline_code VARCHAR2, airline_name CLOB, note CLOB)
CREATE TABLE flight_fare (flight_id NUMBER, fare_id NUMBER)
CREATE TABLE state (state_code CLOB, state_name CLOB, country_name CLOB)
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 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 dual_carrier (main_airline VARCHAR2, low_flight_number NUMBER, high_flight_number NUMBER, dual_airline VARCHAR2, service_name CLOB)
CREATE TABLE time_interval (period CLOB, begin_time NUMBER, end_time NUMBER)
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 food_service (meal_code CLOB, meal_number NUMBER, compartment CLOB, meal_description VARCHAR2)
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 equipment_sequence (aircraft_code_sequence VARCHAR2, aircraft_code VARCHAR2)
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 date_day (month_number NUMBER, day_number NUMBER, year NUMBER, day_name VARCHAR2)

i need flight and fare information departing from OAKLAND to SALT LAKE CITY on thursday before 800
SELECT DISTINCT flight.flight_id FROM fare, flight, flight_fare WHERE (((flight.departure_time < 800 AND flight.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 = 24 AND DATE_DAYalias0.month_number = 5 AND DATE_DAYalias0.year = 1991))) AND flight.to_airport IN (SELECT AIRPORT_SERVICEalias1.airport_code FROM airport_service AS AIRPORT_SERVICEalias1 WHERE AIRPORT_SERVICEalias1.city_code IN (SELECT CITYalias1.city_code FROM city AS CITYalias1 WHERE CITYalias1.city_name = 'SALT LAKE CITY'))) AND flight.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 = 'OAKLAND'))) AND fare.fare_basis_code IN (SELECT FARE_BASISalias0.fare_basis_code FROM fare_basis AS FARE_BASISalias0 WHERE FARE_BASISalias0.basis_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 = 24 AND DATE_DAYalias1.month_number = 5 AND DATE_DAYalias1.year = 1991))) AND flight_fare.fare_id = fare.fare_id AND flight.flight_id = flight_fare.flight_id
WITH "_u_6" AS (SELECT "DATE_DAYalias1"."day_name" FROM "date_day" "DATE_DAYalias1" WHERE "DATE_DAYalias1"."day_number" = 24 AND "DATE_DAYalias1"."month_number" = 5 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_8" AS (SELECT "FARE_BASISalias0"."fare_basis_code" FROM "fare_basis" "FARE_BASISalias0" LEFT JOIN "_u_7" "_u_7" ON "FARE_BASISalias0"."basis_days" = "_u_7"."" WHERE NOT "_u_7"."" IS NULL GROUP BY "fare_basis_code"), "_u_0" AS (SELECT "DATE_DAYalias0"."day_name" FROM "date_day" "DATE_DAYalias0" WHERE "DATE_DAYalias0"."day_number" = 24 AND "DATE_DAYalias0"."month_number" = 5 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_2" AS (SELECT "CITYalias1"."city_code" FROM "city" "CITYalias1" WHERE "CITYalias1"."city_name" = 'SALT LAKE CITY' GROUP BY "city_code"), "_u_3" AS (SELECT "AIRPORT_SERVICEalias1"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias1" LEFT JOIN "_u_2" "_u_2" ON "AIRPORT_SERVICEalias1"."city_code" = "_u_2"."" WHERE NOT "_u_2"."" IS NULL GROUP BY "airport_code"), "_u_4" AS (SELECT "CITYalias0"."city_code" FROM "city" "CITYalias0" WHERE "CITYalias0"."city_name" = 'OAKLAND' GROUP BY "city_code"), "_u_5" AS (SELECT "AIRPORT_SERVICEalias0"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias0" LEFT JOIN "_u_4" "_u_4" ON "AIRPORT_SERVICEalias0"."city_code" = "_u_4"."" WHERE NOT "_u_4"."" IS NULL GROUP BY "airport_code") SELECT DISTINCT "flight"."flight_id" FROM "fare" LEFT JOIN "_u_8" "_u_8" ON "_u_8"."" = "fare"."fare_basis_code" JOIN "flight_fare" ON "fare"."fare_id" = "flight_fare"."fare_id" JOIN "flight" ON "flight"."departure_time" < 800 AND "flight"."flight_id" = "flight_fare"."flight_id" LEFT JOIN "_u_1" "_u_1" ON "_u_1"."" = "flight"."flight_days" LEFT JOIN "_u_3" "_u_3" ON "_u_3"."" = "flight"."to_airport" LEFT JOIN "_u_5" "_u_5" ON "_u_5"."" = "flight"."from_airport" WHERE NOT "_u_1"."" IS NULL AND NOT "_u_3"."" IS NULL AND NOT "_u_5"."" IS NULL AND NOT "_u_8"."" IS NULL