Finding Database Version

select * from v$version;

BANNER

Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production

PL/SQL Release 11.1.0.7.0 - Production

CORE 11.1.0.7.0 Production

TNS for Linux: Version 11.1.0.7.0 - Production

NLSRTL Version 11.1.0.7.0 - Production