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If the deletion violates referential integrity constraint, then three alternatives are available: Default option: - refuse the deletion. It is the job of the DBMS to describ
What are the various forms of data transparency? a) fragmentation transparency b) replication transparency c) location transparency
Example : Search the name, department number and salary of employees drawing minimum salary in that department. SELECT ENAME, SAL, DEPTNO FROM EMP WHERE SAL IN (SELECT MI
What is the difference between link and reference? The fundamental difference between links and references is that links are symmetrical on the other hand references refer only
What are composite objects? Objects that have other objects are known as complex objects or composite objects.
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Define multivalued dependency and 4NF. Ans: Multivalued Dependency - Assume R be a relation schema and let α ⊆ R and β ⊆ R. The multivalued dependency α →→β holds o
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
what is primary key
Software failures : In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of pr
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