If you use Homebrew, installing PostgreSQL (and a lot of other packages) is really easy. Just type the following command in Terminal:
brew install postgresql
Normally you need to initialize the database with
But again if you installed PostgreSQL with Homebrew, this is already done for you.
Next you can start PostgreSQL server with:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
And stop it with:
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
After knowing how to start/stop the database server, it is time to create some databases and user accounts, or roles as they are called in PostgreSQL. This part is pretty complicated, and I’ll only cover a tiny little bit. For more detail, please refer to the offical documentation.
The installation process will also create a database named
postgres and a role with permission to create new databases. On OSX, the new role has the same name as the current operating system user; but on Ubuntu, this role is named
postgres. There are a few useful commands to manage databases and roles:
# create database createdb my_db_name # remove database dropdb my_db_name # create role/user createuser username # remove role/user dropuser username
You can use the
psql command to connect to PostgreSQL server from terminal:
If the database name is not specified, it will default to the current user name.
You can connect to the database as a different role with
psql -U another_role mydb
You’ll see something like this in psql:
psql (9.4.4) Type "help" for help. mydb=#
The last line is
mydb=#, which means you are a database superuser. For a normal database user, the last line look like this:
psql prompt, you can use
\h to get help about syntax of SQL commands,
\? for help with
psql commands and
\q to quit.