Database Redesign
Database redesign is not terribly difficult if the:

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

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Database Redesign
The EXISTS keyword will be true if:

both of these two conditions are met.
neither of these two conditions is met.
all rows in the subquery fail the condition only.
any row in the subquery meets the condition only.

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Database Redesign
Changing cardinalities in a database is:

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

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