Database Redesign
Database redesign is not terribly difficult if the:

database has no data.
database is well-designed.
database is relatively small.
database is structured.

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Database Redesign
Changing cardinalities in a database is:

a database design task that never occurs.
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 common database design task.

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