Introduction to Databases - SQL, NoSQL, Graph Databases, Blockchain

Thanks for the lesson. Here is what i understood ,so we have 4 types of Databases:
1,Relational -SQL
2.Key-Value -No SQL-Moong DB
3, Multi-relational/complex (data mining)-Graph
4. Blockchain-Append only. public(some are private), immutable database,
Is this correct for now. Can Graph be used for Data mining. Thanks

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