Rules that you follow to preserve the defined relationships between tables
when you enter or delete records. If you enforce referential integrity,
Microsoft Access prevents you from adding records to a related table when
there is no associated record in the primary table, changing values in the
primary table that would result in orphan records in a related table, and
deleting records from the primary table when there are matching related
records in a related table.
The "how" is create a relation between two tables and select that you want
to enforce referential integrity.
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