Difference between abstract class and interface; why use one over the other. OOP concepts. Perform basic queries. Database concepts (index, foreign key, primary key, joins). Coding questions with arrays/loops. More brainteasers.

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Difference between abstract class and interface; why use one over the other.   OOP concepts.   Perform basic queries.  Database concepts (index, foreign key, primary key, joins).  Coding questions with arrays/loops.  More brainteasers.

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