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What is Primary key?
Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
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Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts. T9 T10 Value of x old value = 200
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
DROP TABLE Command: When an existing object is not needed for further use, it is always better to eliminate it from the database. To remove the existing object from the databas
Demonstrate the Design of associations During object design phase we must design a strategy to implement associations. Association may be unidirectional or bi-directional. Wha
explain the steps for reduction of er model into relational model?
What is an E-R model? Draw an E-R Diagram for the company database with following Descriptions? The company is organized within departments. Each department has a unique name a
Briefly describe the different kinds of users of a DBMS. Ans: Different sorts of DBMS users are: (a) Software Engineers: These are the people accountable for developing ap
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