In PostgreSQL DROP DATABASE statement is used for removing any existing database in server. Login to PostgreSQL database command prompt using command ‘sudo -u postgres psql‘ from terminal.

Syntax :-

DROP DATABASE [IF EXISTS] database_name

Options:-

• IF EXISTS – Using this option, drop command will not return error if database does not exists.
• database_name – Replace with name of database.

Example :-

Login to your PostgreSQL server using command line. You will get PostgreSQL database prompt like postgres=# . Now use DROP DATABASE statement to delete database.

postgres=# DROP DATABASE mydb;

or you can use command like below

postgres=# DROP DATABASE IF EXISTS mydb;

If everything goes successfully, you will get output like “DROP DATABASE” only.

To confirm that database has been deleted use l or list command to list all databases.

postgres=# list


                            List of databases
   Name    |  Owner   | Encoding | Collate | Ctype |   Access privileges
-----------+----------+----------+---------+-------+-----------------------
 postgres  | postgres | UTF8     | en_IN   | en_IN |
 template0 | postgres | UTF8     | en_IN   | en_IN | =c/postgres          +
           |          |          |         |       | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_IN   | en_IN | =c/postgres          +
           |          |          |         |       | postgres=CTc/postgres
(3 rows)

Reference: http://www.postgresql.org/docs/9.4/static/sql-dropdatabase.html