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Terminology for one-to-one, many-to-one relationships concepts?

Some data is structured so there is only one piece of information that can be associated with an entity. For example, a table with columns (id, name, phone) implies that each id has one name and one ...
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What is the graveyard compaction in cassandra?

Cassandra noob here. While going through the documentation etc, I'm repetitevely finding references to graveyard compaction (and occasionally tombstones), example: $ cassandra-cli [default@unknown] ...