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There are 9 database models..
  1. Hierarchical Model
  2. Network Model
  3. Relational Model
  4. Object/Relational Model
  5. Object-Oriented Model
  6. Semistructured Model
  7. Associative Model
  8. Entity-Attribute-Value (EAV) data model
  9. Context Model

Please refer to the link below for more information.

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Q: How many types of database structure are there?
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What is assigning names and field types when a database is first created?

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When you initially create a database you define its that is you assign names and types to all the fields?

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