Would foreign keys be necessary to a database design?

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Database
Database design
Foreign keys
I'm pretty new to database design so I'm trying to figure out how important foreign keys really are for the design. I know they aid the programmer to manipulate data but say the person already knows how to do that. Are they really necessary then? Thanks.

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Yes they are necessary. 

They are essential for data integrity and are very useful to “document” the relationships between your tables.

Depending on the technologies used for development, they could be crucial for ORM (JPA, for example).

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