Entity Relational Diagram, Database Management System

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What is an ERD?

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What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.

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Define Join and Outer Join and differentiate between them.      Ans: Join - It generates all the combinations of tuples from two relations which satisfy a join condition.  Oute

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Concurrency issues Data integrity: Threads accessing same object need to be synchronized, such as: banking account. Deadlock: One or more threads in system are perman

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