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Please remember to stop the Postgres server , whenever you are done working on the assignment. Otherwise, when you resume your work there may be subtle, hard-to-detect problems server running out of threads, etc. You can automatically do this by adding the following command to your. For more information, check out the reference documentation. You may develop your code anywhere, but make sure it runs correctly on a ghc machine.

We provide set up commands in BASH - modify accordingly, for other shells. Log into your cluster machine remember to replace ghcXX with your assigned machine :. On the cluster machine, run the following commands remember to replace YYYYY with your assigned port :. For this homework, we provide the script for setting up Postgres, along with the input data. Please do not change the provided makefile. Download Homework Data Set The write-up for this assignment is available here.

The data set tarball contains the start-up directory for setting up Postgres and template for SQL answers. Important - Stop the Server! In this homework, you need to do two things: A import the flights dataset into SQLite and B run SQL queries to answer a set of questions about the data. We describe each of those steps in detail below.

To import the flights database into SQLite, first, run sqlite3 with a new database file for example, " sqlite3 hw2. To enable foreign keys use the following command. The command will have no effect if your version of SQLite was not compiled with foreign keys enabled. If so, do not worry about that. Finally, use the SQLite. See examples of. Put all the SQL code for part A that is, four create table statements and four.

For each question below, write a single SQL query to answer that question. Put your queries in a file called hw2-queries. Add a comment to each query indicating 1 the question it answers and 2 the number of rows in the query result. For each question below, write a SQL query to find the answer. As a hint, after each question, we provided the number of rows that should be in your answer written between [ ] brackets after the question.

Find all flights from Seattle to Boston on July 15th Search only for itineraries that have one stop. Both legs of the flight must have occurred on the same day and must be with the same carrier. For each itinerary, the query should return the name of the carrier, the first flight number, the origin and destination of that first flight, the flight time, the second flight number, the origin and destination of the second flight, the second flight time, and finally the total flight time.

Be sure to save all files you create during this homework: you will need them in later homeworks. Overview In this homework, you will write several SQL queries on a relational flights database. Importing the Flights Database [5 points] To import the flights database into SQLite, first, run sqlite3 with a new database file for example, " sqlite3 hw2.

Important Notes To receive full credit, make sure your answers obey the following rules: The predicates in your queries should correspond to the English descriptions.

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