How to make Queries more efficient? How to create smart datasets for testing? Questions about classes, inheritance, polymorphism, and static classes in Java. Questions about knowledge on DB table indexing.

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How to make Queries more efficient?  How to create smart datasets for testing?   Questions about classes, inheritance, polymorphism, and static classes in Java.  Questions about knowledge on DB table indexing.

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You need to know how DB tables indexing can be efficient in certain cases and hurtful to query response times in other cases.  You have to know your concepts about Java class definitions and how to used them to solve problems.

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