Postgres
Operation
psql -h <HOSTNAME> -U <USER> [<DB>]
psql <DB> <USER>
\l // show databases
\c <DB> // connect to DB
\d <TABLE> // show schema of table
\dt // show tables
<SQL>; // e.g.
CREATE DATABASE "<DB>"; // !!! SQL case sensitive, DB to be enclosed in " otherwise no case sensitiveness, semicolon needed
DROP TABLE %lt;TABLE>;
dropdb -h <HOSTNAME> -U <User> <DB>
createdb -h <HOSTNAME> -U <User> <DB>