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installing-postgresql.md

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PostgreSQL Installation

Projected Time

15 minutes

Objectives

Participants will be able to:

  • Use PostgreSQL from the command line (psql) and, optionally, a GUI admin app

Install PostgreSQL on Mac with Homebrew

Step 1: Install Homebrew

Previously we have installed Homebrew, if not follow the instruction on Homebrew site

Run the following two commands to make sure that Homebrew installation is healthy, and up to date:

 brew doctor
 brew update

Step 2: Install postgresql

brew install postgresql

Check the version of PostgreSQL using this command

psql --version

Step 3: Start the Postgres service

You can start PostgreSQL services with this command:

brew services start postgresql

To test that it works, we can create the default database:

createdb `whoami`

Note: If you get any error like this createdb: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed: No such file or directory try this command

rm -rf /usr/local/var/postgres
initdb /usr/local/var/postgres -E utf8

Note: If you get any error like this psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed: FATAL: database "<username>" does not exist, it is likely because the homebrew default setup didn't create a default database for your user. Try the below command to rectify the issue:

createdb

To stop PostgreSQL run

brew services stop postgres

To restart PostgreSQL

brew services restart postgres

Step 4: Login to PostgreSQL database

 psql postgres

You will see the following output

$  psql postgres
psql (14.1)
Type "help" for help.

postgres=#

Congratulation now you have successfully login to the postgres. Try some of the commands

Commands Description
\du to list all the users
\l to list all the databases
CREATE DATABASE mydb; to create a database. Here mydb is the name of the database
\c mydb; to connect to a database
\d to list all the tables inside a database
\q to exit or quit from psql

Configuration

Being a database, Postgres stores most of its settings in itself! So the config file isn't really useful for us.

Postico GUI App

Note: Some participants had issues last cohort with the data not syncing properly while creating tables using Postico. Please do not use it to create or modify your tables, think of it as a visual to see the tables you have.

Install: https://eggerapps.at/postico/

If you created a DB of your user, it should work out of the box if you specify localhost to connect.

PGAdmin GUI App

This is not recommended because it is too advanced and difficult to connect.

Problems

Passwords? with the default setup you shouldn't need a password.

Supplemental Materials

  • Commands - A list of PostgreSQL commands on a GitHub gist.