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Introduction to PostgreSQL for MySQL Users

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Revision as of 17:44, 29 August 2016 by Mhan (talk | contribs) (→‎listing all tables: add Change the password of a user)
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Last tested on Ubuntu 16.04.01 LTS (xenial)

Getting into DB console.

MySQL:

$ mysql -uroot -p

PostgreSQL:

$ sudo su postgres
postgres@hydrogen:~$ psql

Creating DB

Creating a database and granting a user complete access.

MySQL:

mysql> create database mydb;
mysql> grant all on mydb.* to dbuser@localhost identified by 'mypass';

PostgreSQL:

postgres=# create user dbuser with password 'mypass';
postgres=# create database mydb;
postgres=# grant all privileges on database mydb to dbuser;

Listing DBs

You can list the DBs.

MySQL:

mysql> show databases;

PostgreSQL:

postgres=# \l

selecting a DB

You can select a DB.

MySQL:

mysql> use mydb;

PostgreSQL:

postgres=# \connect mydb;

After selecting a DB you can go ahead and execute SQL commands.

listing all tables

You can list tables in a DB.

MySQL:

mysql> show tables;

PostgreSQL:

postgres=# \dt

Change the password of a user

You can list tables in a DB.

MySQL:

mysql> set password for 'dbuser'@'localhost' = password('newpassword');

PostgreSQL:

postgres=# alter user "dbuser" with password 'newpassword';

Exiting from DB

Ctrl-D should exit from both.