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106 lines
3.5 KiB
106 lines
3.5 KiB
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---
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Title: Airplanes & Airports <br>
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Type: Lab <br>
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Created By: Matt Huntington<br>
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Modified By: Jerrica Bobadilla
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---
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## Setup
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1. Create a new database called `flights`, connect to it, and run the following code (given to you in the `flights.sql` file):
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- Note: You can run this .sql file using `psql <db_name> -f <path_to_file>`
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```sql
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CREATE TABLE airlines (
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id int,
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name varchar(255) DEFAULT NULL,
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alias varchar(255) DEFAULT NULL,
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iata varchar(255) DEFAULT NULL,
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icao varchar(255) DEFAULT NULL,
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callsign varchar(255) DEFAULT NULL,
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country varchar(255) DEFAULT NULL,
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active varchar(255) DEFAULT NULL
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);
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CREATE TABLE airports (
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id int,
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name varchar(255) DEFAULT NULL,
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city varchar(255) DEFAULT NULL,
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country varchar(255) DEFAULT NULL,
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iata_faa varchar(255) DEFAULT NULL,
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icao varchar(255) DEFAULT NULL,
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latitude varchar(255) DEFAULT NULL,
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longitude varchar(255) DEFAULT NULL,
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altitude varchar(255) DEFAULT NULL,
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utc_offset varchar(255) DEFAULT NULL,
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dst varchar(255) DEFAULT NULL,
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tz varchar(255) DEFAULT NULL
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);
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CREATE TABLE routes (
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airline_code varchar(255) DEFAULT NULL,
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airline_id int DEFAULT NULL,
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origin_code varchar(255) DEFAULT NULL,
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origin_id int DEFAULT NULL,
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dest_code varchar(255) DEFAULT NULL,
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dest_id int DEFAULT NULL,
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codeshare varchar(255) DEFAULT NULL,
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stops int DEFAULT NULL,
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equipment varchar(255) DEFAULT NULL
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);
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```
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1. In terminal, connect to your `flights` database
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1. Once inside the psql database (you'll know you're in the right one if your terminal says `flights=#`), run the following lines individually
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```
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\copy routes FROM 'routes.csv' DELIMITER ',' CSV
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```
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- You should get back `COPY 67663` if you were successful
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```
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\copy airports FROM 'airports.csv' DELIMITER ',' CSV
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```
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- You should get back `COPY 8107` if you were successful
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```
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\copy airlines FROM 'airlines.csv' DELIMITER ',' CSV
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```
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- You should get back `COPY 6048` if you were successful
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1. You should now have seeded three tables with flight data!
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## Activity
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> Our **main goal is to find out how many flights go from NYC to Paris.**
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### Hints
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- The routes table has a column called `origin_id` and another called `dest_id`. These map to the `id` column in the airport table. Think about how to treat the `id`s as foreign keys.
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- You're going to have to use the airports table twice in the same SQL statement. In order to tell which airport is the `destination` and which is the `origin`, you're going to have to temporarily rename the airports table like so:
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```sql
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/* note that once you rename a table, you MUST refer to it by its new name */
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SELECT * FROM airports AS origin WHERE origin.city = 'New York';
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/* later on in the SQL statement, when dealing with the destination, you should do the same for airports AS destination */
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```
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- Note that you'll only need to use the routes and airports tables
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- Think about using aggregation and inner joins
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### Steps to think about
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1. Find all airports that originate from New York
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1. Find all destination airports in Paris
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1. Find out how many routes originate from New York
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1. Find out how many routes have destinations in Paris
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1. Try to decide which statements are necessary and find how to combine them to find out how many routes originate from New York and land in Paris!
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## Stretch Goals
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- Do this so that just the number appears as the result of only one SQL statement
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- Which airlines travel from NYC to Paris?
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- Find all the flights that leave NYC. Give a list of how many go to each destination city.
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