--创建同义词
FOR Clause
Specify the object for which the synonym is created. The schema object for which you are creating the synonym can be of the following types:
Table or object table
View or object view
Sequence
Stored procedure, function, or package
Materialized view
Java class schema object
User-defined object type
Synonym
The schema object need not currently exist and you need not have privileges to access the object.
Restriction on the FOR Clause
The schema object cannot be contained in a package.
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