What is object in java? What are interfaces? How do you query from one or more sql tables? What is the technique to optimally query from a huge database? The answer should be it depends,but we went to the direction of indexing and we were talking about indexing of a db table. The algorithm should be solved with hashmap and recursion.

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What is object in java? What are interfaces? How do you query from one or more sql tables? What is the technique to optimally query from a huge database?  The answer should be it depends,but we went to the direction of indexing and we were talking about indexing of a db table. The algorithm should be solved with hashmap and recursion.

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