Which two are true regarding external tables？（）<br>A:External tables can be updated. <br>B:External tables are read-only tables. <br>C:Indexes can be created on external tables. <br>D:Indexes cannot be created on external tables.

Which two are true regarding external tables？（）
A:External tables can be updated.
B:External tables are read-only tables.
C:Indexes can be created on external tables.
D:Indexes cannot be created on external tables.

出自：Oracle认证

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