SQL for Database Construction
A reason for using an SQL view to hide columns is:

None of these
to simplify a result only.
to accomplish both of the above.
to prevent the display of sensitive data only.

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SQL for Database Construction
The DROP TABLE statement:

works whether or not referential integrity constraints would be violated.
deletes the table structure only.
is not an SQL statement.
deletes the table structure along with the table data.

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