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	Category	Difficulty	Refers
Choosing the primary key ID Generator	Data Model	Intermediate	WebRatio
E-R Schema	Technical Reference	Beginner	Entity Relation
Getting started with the Data Model Unit	Web Model	Advanced	Data Model Unit Query Unit
Getting started with the Query Unit	Web Model	Advanced	Query Unit Data Model Unit
How to implement a custom database Metadata provider	Data Model	Advanced	WebRatio
The Data Model Mapping	Data Model	Beginner	Entity Relation Attribute
The cascade delete	Data Model	Intermediate	Delete Unit
The derivation in the data model	Data Model	Beginner	Derived Entity Derived Relation Derived Attribute
Which are the steps to follow in order to correctly import a bridge table in the data model?	Data Model	Beginner	Entity