database relational model, Database Management System

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what do you mean by primary key constraint?

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Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t

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Limitations of File Based System The file-based system has some limitations. The limitations are listed as follows: Isolation and separation of data: When the data is

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What do you mean by Correlated subquery? Subqueries, or nested queries, are used to bring back a set of rows to be used by the parent query. Depending on how the subquery is writ

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When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.

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What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.

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