diff --git a/PostgreSQL.py b/PostgreSQL.py
index 24200f2..fb4617c 100644
--- a/PostgreSQL.py
+++ b/PostgreSQL.py
@@ -13,54 +13,54 @@ def create_tables():
     sql_command_create_table= (
         """CREATE TABLE airlines
         (
-            IATA_CODE VARCHAR(2),
-            AIRLINE VARCHAR(30)
+            "IATA_CODE" VARCHAR(2),
+            "AIRLINE" VARCHAR(30)
         )
         """,
         """CREATE TABLE airports
         (
-            IATA_CODE VARCHAR(3),
-            AIRPORT VARCHAR(100),
-            CITY VARCHAR(40),
-            STATE VARCHAR(2),
-            COUNTRY VARCHAR(40),
-            LATITUDE REAL,
-            LONGITUDE REAL
+            "IATA_CODE" VARCHAR(3),
+            "AIRPORT" VARCHAR(100),
+            "CITY" VARCHAR(40),
+            "STATE" VARCHAR(2),
+            "COUNTRY" VARCHAR(40),
+            "LATITUDE" REAL,
+            "LONGITUDE" REAL
         )
         """,
         """CREATE TABLE flights
         (
-            YEAR INTEGER,
-            MONTH INTEGER,
-            DAY INTEGER,
-            DAY_OF_WEEK INTEGER,
-            AIRLINE VARCHAR(2),
-            FLIGHT_NUMBER INTEGER,
-            TAIL_NUMBER VARCHAR(6),
-            ORIGIN_AIRPORT VARCHAR(5),
-            DESTINATION_AIRPORT VARCHAR(5),
-            SCHEDULED_DEPARTURE INTEGER,
-            DEPARTURE_TIME INTEGER,
-            DEPARTURE_DELAY INTEGER,
-            TAXI_OUT INTEGER,
-            WHEELS_OFF INTEGER,
-            SCHEDULED_TIME INTEGER,
-            ELAPSED_TIME INTEGER,
-            AIR_TIME INTEGER,
-            DISTANCE INTEGER,
-            WHEELS_ON INTEGER,
-            TAXI_IN INTEGER,
-            SCHEDULED_ARRIVAL INTEGER,
-            ARRIVAL_TIME INTEGER,
-            ARRIVAL_DELAY INTEGER,
-            DIVERTED INTEGER,
-            CANCELLED INTEGER,
-            CANCELLATION_REASON VARCHAR(1),
-            AIR_SYSTEM_DELAY INTEGER,
-            SECURITY_DELAY INTEGER,
-            AIRLINE_DELAY INTEGER,
-            LATE_AIRCRAFT_DELAY INTEGER,
-            WEATHER_DELAY INTEGER
+            "YEAR" INTEGER,
+            "MONTH" INTEGER,
+            "DAY" INTEGER,
+            "DAY_OF_WEEK" INTEGER,
+            "AIRLINE" VARCHAR(2),
+            "FLIGHT_NUMBER" INTEGER,
+            "TAIL_NUMBER" VARCHAR(6),
+            "ORIGIN_AIRPORT" VARCHAR(5),
+            "DESTINATION_AIRPORT" VARCHAR(5),
+            "SCHEDULED_DEPARTURE" INTEGER,
+            "DEPARTURE_TIME" INTEGER,
+            "DEPARTURE_DELAY" INTEGER,
+            "TAXI_OUT" INTEGER,
+            "WHEELS_OFF" INTEGER,
+            "SCHEDULED_TIME" INTEGER,
+            "ELAPSED_TIME" INTEGER,
+            "AIR_TIME" INTEGER,
+            "DISTANCE" INTEGER,
+            "WHEELS_ON" INTEGER,
+            "TAXI_IN" INTEGER,
+            "SCHEDULED_ARRIVAL" INTEGER,
+            "ARRIVAL_TIME" INTEGER,
+            "ARRIVAL_DELAY" INTEGER,
+            "DIVERTED" INTEGER,
+            "CANCELLED" INTEGER,
+            "CANCELLATION_REASON" VARCHAR(1),
+            "AIR_SYSTEM_DELAY" INTEGER,
+            "SECURITY_DELAY" INTEGER,
+            "AIRLINE_DELAY" INTEGER,
+            "LATE_AIRCRAFT_DELAY" INTEGER,
+            "WEATHER_DELAY" INTEGER
         )
         """)
     try: