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How many database types are there

How many database types are there? (Not brands, Database types)

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Let us discuss about the database types, based on the conceptual structures the database can be classified as follows.
 Flat file database
 Relational database
 Hierarchical database
 Network database
 Object oriented database
Flat file database:
A database file that consists of a single data table is a flat file database. Flat file database can be quite useful for certain single user or small group situations, especially for maintaining lists such as address lists or inventories. Data that is stored, managed, and manipulated in spreadsheet is another example of a flat file database.
Despite their simplicity, flat file database do have significant limitations over database ...

Solution Summary

The solution determines how many database types there are.