Which two statements about views are true? （） A:A view can be created as read only. B:A view can be created as a join on two or more tables. C:A view cannot have an ORDER BY clause in the SELECT statement. D:A view cannot be created with a GROUP BY clause in the SELECT statement. E:A view must have aliases defined for the column names in the SELECT statement.

Which two statements about views are true? （）
A:A view can be created as read only.
B:A view can be created as a join on two or more tables.
C:A view cannot have an ORDER BY clause in the SELECT statement.
D:A view cannot be created with a GROUP BY clause in the SELECT statement.
E:A view must have aliases defined for the column names in the SELECT statement.

出自：Oracle认证

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