I found the same definition for referential and relational integrity. Are they the same? I have researched the two terms separately but cannot find any good definitions.
Are relational integrity and referential integrity the same thing?
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Yes, they are the same thing. The term "Referential Integrity" is used much more though.
Referential Integrity relates to Foreign Keys in a Relational DB. For a table to exhibit Referential Integrity, the Foreign Key must either be null or reference an existing PK value in the related table.