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Define single valued and multivalued attributes.
Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes.
Multivalued attributes: Attributes with a set of value for a particular entity are known as multivalued attributes.
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
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What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
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Consider the table student and list names of students in the departments other than maths and computer. SELECT std_name FRM student WHERE dept_name NOT IN (‘Maths','Computer);
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