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Working with PostgreSQL

In this hands-on lab, we will be standing up a Postgres installation and then importing formatted data.

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Path Info

Clock icon Intermediate
Clock icon 1h 0m
Clock icon May 29, 2019

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Table of Contents

  1. Challenge

    Install PostgreSQL

    1. Add the Postgres repo:
    sudo yum install -y 
    1. Install Postgres and initialize the database:
    sudo yum install -y postgresql11-server.x86_64 
    sudo /usr/pgsql-11/bin/postgresql-11-setup initdb 
    1. Start and enable the service:
    sudo systemctl start postgresql-11
    sudo systemctl enable postgresql-11
  2. Challenge

    Create the Database and Table

    1. Access a login shell for the postgres user:
    sudo su
    su -l postgres
    1. Log in to the server and create resources. Get the table schema from the CSV file you are importing.
    create database city_data;
    \c city_data
    create table city_info(
    id serial NOT NULL,
    LatD numeric,
    LatM numeric,
    LatS numeric,
    NS text,
    LonD numeric,
    LonM numeric,
    LonS numeric,
    EW text,
    City text,
    State text
    ) ;
  3. Challenge

    Validate the Imported Data

    1. Import the CSV data from a location that the postgres user has permissions to access. For instance, as root:
    cp -r /home/cloud_user/data  /var/lib/pgsql/
    1. Once that is complete import the data. If necessary, correct any errors!
    COPY city_info(LatD,LatM,LatS,NS,LonD,LonM,LonS,EW,City,State)
    from '/var/lib/pgsql/data/cities.csv' DELIMITER ',' CSV HEADER;
    1. From the PSQL prompt, query for State='OH' and count the results. There should be 6 cities in Ohio.
    select city from city_info where state='OH';

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