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What is transaction?
Collections of operations that form a single logical unit of work are known as transactions.
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What does conceptual design work? A conceptual design involves modelling independent of the DBMS.
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
(a) Why did SAP introduce the extended star schema?
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be
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
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
What is a candidate key? Minimal super keys are known as candidate keys.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
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