多选题Which two operations can be performed on an external table（）ACreate a view on the table.BCreate an index on the table.CCreate a synonym on the table.DAdd a virtual column to the table.EUpdate the table using the UPDATE statement.FDelete rows in the tab
题目
多选题
Which two operations can be performed on an external table（）
A
Create a view on the table.
B
Create an index on the table.
C
Create a synonym on the table.
D
Add a virtual column to the table.
E
Update the table using the UPDATE statement.
F
Delete rows in the table using the DELETE command.