方法一：v$version
SQL> select * from v$version;
BANNER
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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
方法二：product_component_version
SQL> select * from product_component_version;
PRODUCT VERSION STATUS
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NLSRTL 11.1.0.7.0 Production
Oracle Database 11g Enterprise Edition 11.1.0.7.0 64bit Production
PL/SQL 11.1.0.7.0 Production
TNS for Linux: 11.1.0.7.0 Production
SQL>
方法三：dbms_output.put_line( dbms_db_version.version )
SQL> SET SERVEROUTPUT ON
SQL> EXEC dbms_output.put_line( dbms_db_version.version );
11
PL/SQL procedure successfully completed.
SQL>
Oracle Database History
Since version 5, Oracle\'s RDBMS release numbering has used the following codes:
Oracle v5
Oracle v6
Oracle7: 7.0.16–7.3.4
Oracle8 Database: 8.0.3–8.0.6
Oracle8i Database Release 1: 8.1.5.0–8.1.5.1
Oracle8i Database Release 2: 8.1.6.0–8.1.6.3
Oracle8i Database Release 3: 8.1.7.0–8.1.7.4
Oracle9i Database Release 1: 9.0.1.0–9.0.1.5 (patchset as of December 2003)
Oracle9i Database Release 2: 9.2.0.1–9.2.0.8 (patchset as of April 2007)
Oracle Database 10g Release 1: 10.1.0.2–10.1.0.5 (patchset as of February 2006)
Oracle Database 10g Release 2: 10.2.0.1–10.2.0.5 (patchset as of April 2010)
Oracle Database 11g Release 1: 11.1.0.6–11.1.0.7 (patchset as of September 2008)
Oracle Database 11g Release 2: 11.2.0.1–11.2.0.3 (patchset as of September 2011)
The version-numbering syntax within each release follows the pattern: major.maintenance.application-server.component-specific.platform-specific.
For example, "10.2.0.1 for 64-bit Solaris" means: 10th major version of Oracle, maintenance level 2, Oracle Application Server (OracleAS) 0, level 1 for Solaris 64-bit.
另外，Fenng之前做了一个关于数据库版本使用情况的调查，从图中可以看出现阶段中国地区，使用10gR2版本的仍是绝大多数。
select * from PRODUCT_COMPONENT_VERSION;
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