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Is it things like tables? Or would it also include things like constraints, stored procedures, packages, etc.?
I’ve looked around the internet, but finding elementary answers to elementary questions is sometimes a little difficult.
In the entity relationship world an entity is something that may exist independently and so there is often a one-to-one relationship between entities and database tables. However, this mapping is an implementation decision: For example, an ER diagram may contain three entities: Triangle, Square and Circle and these could potentially be modelled as a single table: Shape.
Also note that some database tables may represent relationships between entities.