Database Redesign
Changing cardinalities in a database is:

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

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Database Redesign
Which is not true of a correlated subquery?

The processing of the SELECT statements is nested.
EXISTS/NOT EXISTS is a form of a correlated subquery.
They can be used to verify functional dependencies.
They are very similar to a regular subquery.

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