Database Redesign
The NOT EXISTS keyword will be true if:

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

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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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