Database Redesign
The EXISTS keyword will be true if:

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

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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 common database design task.
a rare database design task, but does occur.

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