How to check Oracle version information
Method 1
First open the xshell terminal and log in to server, then switch to the Oracle user, then enter "sqlplus / as sysdba" on the command line, and finally click Enter to print out the Oracle version information.
Method 2
First open plsql and log in to your Oracle account. After logging in , create a new SQL window and enter SQL "select * from v$version", and finally click Enter;
Recommended tutorial: "Oracle Tutorial"
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