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

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

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Database Redesign
Changing cardinalities in a database is:

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

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