Give example of relational schema, Database Management System

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An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not?

If relational schema R (A, B, C) has distinct values of A including NULL values A is not a candidate key.

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Domain Constraints Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relatio

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You will be analysing a set of financial data of your choice. It is not necessary to collect any primary data of your own, and publicly available secondary data will be sufficient

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Example - ALTER TABLE emp MODIFY (empno NUMBER (7));

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Consider the relations described below: PHYSICIAN (regno, name, telno, city) PATIENT (pname, street, city) VISIT (pname, regno, date_of_visit, fee) Where the regno and pname ide

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What are the various symbols used to draw an E-R diagram (any 3)?

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