DROP USER databasename cascade; //Oracle

It is possible to drop a database in Oracle with the new SQL statement drop database. The command gets rid of datafiles online redo log files, controlfiles and spfile.

Example to use the command

shutdown abort;
startup mount exclusive restrict;
drop database;
exit

Requirements

database must be closed,
exclusively mounted,
restricted

Oracle

In Oracle you can use the following query

select object_name from user_objects where object_type = ‘TABLE’;

MYSQL

In MySql you can use the follwing query

show tables;

Get All Schema in Oracle and MySql

ORACLE

We can get all oracle schemas using the following query

SELECT username FROM all_users;
or
SELECT * all_users;

MYSQL

We can get all mysql schemas using the following query

SELECT SCHEMA_NAME FROM information_schema.SCHEMATA;
or
SELECT * information_schema.SCHEMATA;
or
show databases