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

i need a flight leaving KANSAS CITY to CHICAGO leaving next wednesday and returning the following day
SELECT DISTINCT flight_id FROM flight WHERE (((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 = 23 AND DATE_DAYalias0.month_number = 4 AND DATE_DAYalias0.year = 1991)) AND 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 = 'CHICAGO'))) 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 = 'KANSAS CITY'))) OR ((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 = 23 AND DATE_DAYalias1.month_number = 4 AND DATE_DAYalias1.year = 1991)) AND to_airport IN (SELECT AIRPORT_SERVICEalias3.airport_code FROM airport_service AS AIRPORT_SERVICEalias3 WHERE AIRPORT_SERVICEalias3.city_code IN (SELECT CITYalias3.city_code FROM city AS CITYalias3 WHERE CITYalias3.city_name = 'KANSAS CITY'))) AND from_airport IN (SELECT AIRPORT_SERVICEalias2.airport_code FROM airport_service AS AIRPORT_SERVICEalias2 WHERE AIRPORT_SERVICEalias2.city_code IN (SELECT CITYalias2.city_code FROM city AS CITYalias2 WHERE CITYalias2.city_name = 'CHICAGO'))))
WITH "_u_0" AS (SELECT "DATE_DAYalias0"."day_name" FROM "date_day" "DATE_DAYalias0" WHERE "DATE_DAYalias0"."day_number" = 23 AND "DATE_DAYalias0"."month_number" = 4 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 "CITYalias3"."city_code" FROM "city" "CITYalias3" WHERE "CITYalias3"."city_name" = 'KANSAS CITY' GROUP BY "city_code"), "_u_11" AS (SELECT "AIRPORT_SERVICEalias3"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias3" LEFT JOIN "_u_10" "_u_10" ON "AIRPORT_SERVICEalias3"."city_code" = "_u_10"."" WHERE NOT "_u_10"."" IS NULL GROUP BY "airport_code"), "_u_12" AS (SELECT "CITYalias1"."city_code" FROM "city" "CITYalias1" WHERE "CITYalias1"."city_name" = 'CHICAGO' GROUP BY "city_code"), "_u_13" AS (SELECT "AIRPORT_SERVICEalias1"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias1" LEFT JOIN "_u_12" "_u_12" ON "AIRPORT_SERVICEalias1"."city_code" = "_u_12"."" WHERE NOT "_u_12"."" IS NULL GROUP BY "airport_code"), "_u_15" AS (SELECT "AIRPORT_SERVICEalias3"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias3" LEFT JOIN "_u_10" "_u_14" ON "AIRPORT_SERVICEalias3"."city_code" = "_u_14"."" WHERE NOT "_u_14"."" IS NULL GROUP BY "airport_code"), "_u_16" AS (SELECT "DATE_DAYalias1"."day_name" FROM "date_day" "DATE_DAYalias1" WHERE "DATE_DAYalias1"."day_number" = 23 AND "DATE_DAYalias1"."month_number" = 4 AND "DATE_DAYalias1"."year" = 1991 GROUP BY "day_name"), "_u_17" AS (SELECT "DAYSalias1"."days_code" FROM "days" "DAYSalias1" LEFT JOIN "_u_16" "_u_16" ON "DAYSalias1"."day_name" = "_u_16"."" WHERE NOT "_u_16"."" IS NULL GROUP BY "days_code"), "_u_18" AS (SELECT "CITYalias0"."city_code" FROM "city" "CITYalias0" WHERE "CITYalias0"."city_name" = 'KANSAS CITY' GROUP BY "city_code"), "_u_19" AS (SELECT "AIRPORT_SERVICEalias0"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias0" LEFT JOIN "_u_18" "_u_18" ON "AIRPORT_SERVICEalias0"."city_code" = "_u_18"."" WHERE NOT "_u_18"."" IS NULL GROUP BY "airport_code"), "_u_21" AS (SELECT "AIRPORT_SERVICEalias0"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias0" LEFT JOIN "_u_18" "_u_20" ON "AIRPORT_SERVICEalias0"."city_code" = "_u_20"."" WHERE NOT "_u_20"."" IS NULL GROUP BY "airport_code"), "_u_23" AS (SELECT "AIRPORT_SERVICEalias3"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias3" LEFT JOIN "_u_10" "_u_22" ON "AIRPORT_SERVICEalias3"."city_code" = "_u_22"."" WHERE NOT "_u_22"."" IS NULL GROUP BY "airport_code"), "_u_25" AS (SELECT "DAYSalias0"."days_code" FROM "days" "DAYSalias0" LEFT JOIN "_u_0" "_u_24" ON "DAYSalias0"."day_name" = "_u_24"."" WHERE NOT "_u_24"."" IS NULL GROUP BY "days_code"), "_u_26" AS (SELECT "CITYalias2"."city_code" FROM "city" "CITYalias2" WHERE "CITYalias2"."city_name" = 'CHICAGO' GROUP BY "city_code"), "_u_27" AS (SELECT "AIRPORT_SERVICEalias2"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias2" LEFT JOIN "_u_26" "_u_26" ON "AIRPORT_SERVICEalias2"."city_code" = "_u_26"."" WHERE NOT "_u_26"."" IS NULL GROUP BY "airport_code"), "_u_29" AS (SELECT "AIRPORT_SERVICEalias2"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias2" LEFT JOIN "_u_26" "_u_28" ON "AIRPORT_SERVICEalias2"."city_code" = "_u_28"."" WHERE NOT "_u_28"."" IS NULL GROUP BY "airport_code"), "_u_3" AS (SELECT "DAYSalias1"."days_code" FROM "days" "DAYSalias1" LEFT JOIN "_u_16" "_u_2" ON "DAYSalias1"."day_name" = "_u_2"."" WHERE NOT "_u_2"."" IS NULL GROUP BY "days_code"), "_u_31" AS (SELECT "AIRPORT_SERVICEalias1"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias1" LEFT JOIN "_u_12" "_u_30" ON "AIRPORT_SERVICEalias1"."city_code" = "_u_30"."" WHERE NOT "_u_30"."" IS NULL GROUP BY "airport_code"), "_u_33" AS (SELECT "AIRPORT_SERVICEalias0"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias0" LEFT JOIN "_u_18" "_u_32" ON "AIRPORT_SERVICEalias0"."city_code" = "_u_32"."" WHERE NOT "_u_32"."" IS NULL GROUP BY "airport_code"), "_u_35" AS (SELECT "AIRPORT_SERVICEalias2"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias2" LEFT JOIN "_u_26" "_u_34" ON "AIRPORT_SERVICEalias2"."city_code" = "_u_34"."" WHERE NOT "_u_34"."" IS NULL GROUP BY "airport_code"), "_u_5" AS (SELECT "DAYSalias1"."days_code" FROM "days" "DAYSalias1" LEFT JOIN "_u_16" "_u_4" ON "DAYSalias1"."day_name" = "_u_4"."" WHERE NOT "_u_4"."" IS NULL GROUP BY "days_code"), "_u_7" AS (SELECT "AIRPORT_SERVICEalias1"."airport_code" FROM "airport_service" "AIRPORT_SERVICEalias1" LEFT JOIN "_u_12" "_u_6" ON "AIRPORT_SERVICEalias1"."city_code" = "_u_6"."" WHERE NOT "_u_6"."" IS NULL GROUP BY "airport_code"), "_u_9" AS (SELECT "DAYSalias0"."days_code" FROM "days" "DAYSalias0" LEFT JOIN "_u_0" "_u_8" ON "DAYSalias0"."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_11" "_u_11" ON "_u_11"."" = "to_airport" LEFT JOIN "_u_13" "_u_13" ON "_u_13"."" = "to_airport" LEFT JOIN "_u_15" "_u_15" ON "_u_15"."" = "to_airport" LEFT JOIN "_u_17" "_u_17" ON "_u_17"."" = "flight_days" LEFT JOIN "_u_19" "_u_19" ON "_u_19"."" = "from_airport" LEFT JOIN "_u_21" "_u_21" ON "_u_21"."" = "from_airport" LEFT JOIN "_u_23" "_u_23" ON "_u_23"."" = "to_airport" LEFT JOIN "_u_25" "_u_25" ON "_u_25"."" = "flight_days" LEFT JOIN "_u_27" "_u_27" ON "_u_27"."" = "from_airport" LEFT JOIN "_u_29" "_u_29" ON "_u_29"."" = "from_airport" LEFT JOIN "_u_3" "_u_3" ON "_u_3"."" = "flight_days" LEFT JOIN "_u_31" "_u_31" ON "_u_31"."" = "to_airport" LEFT JOIN "_u_33" "_u_33" ON "_u_33"."" = "from_airport" LEFT JOIN "_u_35" "_u_35" ON "_u_35"."" = "from_airport" LEFT JOIN "_u_5" "_u_5" ON "_u_5"."" = "flight_days" LEFT JOIN "_u_7" "_u_7" ON "_u_7"."" = "to_airport" LEFT JOIN "_u_9" "_u_9" ON "_u_9"."" = "flight_days" WHERE (NOT "_u_1"."" IS NULL OR NOT "_u_3"."" IS NULL) AND (NOT "_u_11"."" IS NULL OR NOT "_u_9"."" IS NULL) AND (NOT "_u_13"."" IS NULL OR NOT "_u_15"."" IS NULL) AND (NOT "_u_17"."" IS NULL OR NOT "_u_19"."" IS NULL) AND (NOT "_u_21"."" IS NULL OR NOT "_u_23"."" IS NULL) AND (NOT "_u_25"."" IS NULL OR NOT "_u_27"."" IS NULL) AND (NOT "_u_29"."" IS NULL OR NOT "_u_31"."" IS NULL) AND (NOT "_u_33"."" IS NULL OR NOT "_u_35"."" IS NULL) AND (NOT "_u_5"."" IS NULL OR NOT "_u_7"."" IS NULL)