
If you are looking for Oracle database version, use the below command.
SQL> SELECT * from V$VERSION; BANNER ------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production PL/SQL Release 11.2.0.1.0 - Production CORE 11.2.0.1.0 Production TNS for 64-bit Windows: Version 11.2.0.1.0 - Production NLSRTL Version 11.2.0.1.0 - Production
Alternatively, you can refer to V$INSTANCE: Display Oracle Database & Instance State for the version.

how to upgrade database oracle 10.0 to 11 please its needy
Abbas