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1. What is Key-Value Pair Databases? 2. What is RDBMS?

1. What is Key-Value Pair Databases? 

 2. What is RDBMS? 

3. What are the foundational behaviors of MapReduce? 

4. For E-R model, there are entity sets, relationship sets, and attributes, please offer/describe some example for the three concepts

5. If we keep use Entity, but skip the use of relationship, what kind of operation can be the substitute?


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