Drop command will permanently delete database

SYNTAX

DROP DATABASE <databasae_name>

EX:

----LIST DATABASE ----
postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+--------------------+--------------------+-----------------------
postgres | postgres | UTF8 | English_India.1252 | English_India.1252 |
sachin | postgres | UTF8 | English_India.1252 | English_India.1252 |
template0 | postgres | UTF8 | English_India.1252 | English_India.1252 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | English_India.1252 | English_India.1252 | =c/postgres +
| | | | | postgres=CTc/postgres
(4 rows)

Delete database ‘sachin’ from list of databases

postgres=# drop database sachin;
DROP DATABASE

postgres=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+--------------------+--------------------+-----------------------
postgres | postgres | UTF8 | English_India.1252 | English_India.1252 |
template0 | postgres | UTF8 | English_India.1252 | English_India.1252 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | English_India.1252 | English_India.1252 | =c/postgres +
| | | | | postgres=CTc/postgres
(3 rows)

sachin database is dropped