database relational model, Database Management System

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what do you mean by primary key constraint?

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Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→ a, ab → d, a → b, d → c}, i.e. what are all of the FDs implied b

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For known, What are the function of DBA?

What are the function of DBA?

Schema, difference between internal schema and external schema in DBMS

difference between internal schema and external schema in DBMS

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