What is the command to see the database

what is the command to see the database?iam using oracle express edition in that i tried to create a database but it showing database already created.
i need to check which database is created.

Probably you are thinking that Oracle database is a kind of file something like which we sees other files like .txt, .doc, .pdf etc which we sees by ls or dir commands. Of course there are files for Oracle database, but they have their own nomenclature and setup which finds in C:\oraclexe\oradata\XE\ (For example in Windows) or /usr/lib/oracle/xe/oradata/XE/ (For example in Linux).
By default, the database is started for you after installation and every time your computer is restarted. However, to reduce the overall performance load on the system, you can manually stop the database, and then manually restart it later.
Oracle&reg; Database Express Edition
Ok, now if you wish to login to the database (we don't says "see" the database, because database is different thing than a picture or image ), you just open your command window and say :
sqlplus sys/your_password_of_sys_user as sysdba
If you get SQL> prompt, you have logged in the database as sys user and this is your database.
If you wish to login with different user then you can :
1.login from command window by sqlplus username/password
2.login from SQL> prompt by connect username/password
Regards
Girish Sharma

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