ORA-12514: TNS: The listener currently cannot recognize the service requested in the connection desc

Microsoft Windows [版本 6.1.7601]
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C:\Users\Administrator>sqlplus /nolog

SQL*Plus: Release 11.2.0.1.0 Production on 星期六 12月 3 01:25:05 2022

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SQL> conn sys/oracle@orcl as sysdba
ERROR:
ORA-12514: TNS: The listener currently cannot recognize the service requested in the connection descriptor


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