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Define the following constraints for the table client.
(i) BAL_DUE must be at least 1000.(ii) NAME is a unique key.
(i)ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_BAL_DUE_C1 CHECK(BAL_DUE < 1000); (ii) ALTER TABLE CLIENT ADD CONSTRAINT CLIENT_NAME_U UNIQUE(NAME);
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Define average seek time. The average seek time is the average of the seek times, calculated over a sequence of random requests.
Identify the need and use of data control through problem solving, illustration
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
what is completeness constrent?
Write a short note on built in function in QBE? Built in function in QBE: QBE involves various built in functions like AVG, MAX,MIN,SUM and CNT. We must prefix these operator
what is Storage-Device Hierarchy question
explain exhausitively the problems associated with er diagrams with ellustrations
Explain about database system structure? Storage manager Authorization and integrity manager Transaction manager File manager Buffer manager Storage manager
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