Why do I have to add the Schema name to a table created under SYSTEM.

The TABLE was created under the SYSTEM account & PSW and accessed under SYSTEM & PSW.

user2661022 wrote:
The TABLE was created under the SYSTEM account & PSW and accessed under SYSTEM & PSW.The other responses are correct, but do not answer your question.
The issue you are facing is in the way Oracle built the database engine. Basically every table requires a full qualification, that is to use the schema and the table. For your convenience Oracle has a default 'current_schema' that is used as the default value when the schema is not provided.
TO confuse the situation even more, you are allowed to create synonyms that can translate to a fully qualified table (or more accurately fully qualified object).
So you will be required to fully qualify every table name unless they are in the current schema. But the qualification nay come from system or session defaults or through synonyms.
Knowing that 10gR2 Express Edition is a proper subset of 10gR2, if you go to the 10gR2 full documentation, you will find a Reference manual that includes session and system parameters (such as current_session) that you can use to manage your environment.

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