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What is theta join explain? Theta Join - The theta join operation is an extension to the natural-join operation which permits us to merge selection and a Cartesian
why are older data models are being replaced by new data models
What is a Transaction? A transaction is an event which happens on the database. Generally a transaction reads a value from the database or writes a value to the database. If y
What are attributes? Give examples. An entity is shown by a set of attributes. Attributes are descriptive properties possessed by every member of an entity set. Example: pos
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
sql is relationally complete-justify
Explain natural join? Natural Join - Similar as equi-join except in which the join attributes (having similar names) are not involved in the resulting relation. Only one sets
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
Consider the subsequent relation Professor (Pfcode, dept, head, time) It is assumed that (i) A professor can work in much more than one
What are composite attributes? Composite attributes can be separated in to sub parts.
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