As mentioned in previous answers, you can prefix the name of the object with the name of the scheme:
SELECT * FROM schema_name.the_table;
Or you can use a synonym (private or public):
CREATE (PUBLIC) SYNONYM the_table FOR schema_name.the_table;
Or you can issue the alter session command to set the default scheme to the one you want:
ALTER SESSION SET current_schema=schema_name;
Note that this simply sets the default schema and is the equivalent of prefixing all (unqualified) object names with schema_name . You can prefix objects with a different schema name to access an object from another schema. Using SET current_schema does not affect your privileges: you still have the privileges of the user you are logged into, and not with the scheme you set.
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