多项选择题

Which two statements about creating constraints are true?（）

A. Constraint names must start with SYS_C
B. All constraints must be defines at the column level.
C. Constraints can be created after the table is created.
D. Constraints can be created at the same time the table is created.
E. Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.

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单项选择题

You are granted the CREATE VIEW privilege. What does this allow you to do? （）

A. Create a table view.
B. Create a view in any schema.
C. Create a view in your schema.
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E. Create a view that is accessible by everyone.
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F. All data in the table is deleted, but the structure of the table is retained.
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Which statement describes the ROWID data type? （）

A. Binary data up to 4 gigabytes.
B. Character data up to 4 gigabytes.
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