Database Redesign
Which of the following SQL statements are helpful in database redesign?

None of these
Correlated subqueries only
Both of the above are helpful
EXISTS/NOT EXISTS expressions only

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Database Redesign
Changing cardinalities in a database is:

a common database design task.
is impossible to do, so a new database must be constructed and the data moved into it.
a rare database design task, but does occur.
a database design task that never occurs.

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