SELECT * FROM v$version;

BANNER                                                          
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Oracle8i Personal Edition Release 8.1.5.0.0 - Production        
PL/SQL Release 8.1.5.0.0 - Production                           
CORE Version 8.1.5.0.0 - Production                             
TNS for 32-bit Windows: Version 8.1.5.0.0 - Production          
NLSRTL Version 3.4.0.0.0 - Production