多选题Which two are true regarding external tables？ （）AExternal tables can be updated.BExternal tables are read-only tables.CIndexes can be created on external tables.DIndexes cannot be created on external tables.
多选题
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.
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