在命令行中登录oracle数据库:
    sqlplus username/password  如:普通用户登录  sqlplus scott/tiger
    sqlplus username/password as sysdba 如:sqlplus sys/admin as sysdba
    sqlplus username/password@net_service_name 如: sqlplus scott/tiger@orcl
    sqlplus username/password@//host:port/sid 

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命令行(cmd)登录oracle数据库