PostgreSQL commands to remember

List of commands to remember using postgres DB managment system.

Login, Create user and password

# login to psql client
psql postgres # OR
psql -U postgres
create database mydb; # create db
create user abhilash with SUPERUSER CREATEDB CREATEROLE encrypted password 'abhilashPass!'; 
grant all privileges on database mydb to myuser; # add privileges

Connect to DB, List tables and users, functions, views, schema

\l # lists all the databases
\c dbname # connect to db
\dt # show tables
\d table_name # Describe a table
\dn # List available schema
\df #  List available functions
\dS [your_table_name] # List triggers
\dv # List available views
\du # lists all user accounts and roles 
\du+ # is the extended version which shows even more information.

Show history, save to file, edit using editor, execution time, help

SELECT version(); # version of psql
\g  # Execute the previous command
\s # Command history
\s filename # save Command history to a file
\i filename # Execute psql commands from a file
\? # help on psql commands
\h ALTER TABLE # To get help on specific PostgreSQL statement
\timing #  Turn on/off query execution time
\e # Edit command in your own editor
\e [function_name] # It is more useful when you edit a function in the editor. Do \df for functions
\o [file_name] # send all next query results to file
    \o out.txt
    \dt 
    \o # switch
    \dt

Change output, Quit psql

# Switch output options
\a command switches from aligned to non-aligned column output.
\H command formats the output to HTML format.
\q # quit psql

Reference: https://www.postgresqltutorial.com/postgresql-administration/psql-commands/