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Update Anomaly: This anomaly is occurred due to data redundancy. Redundant information makes updates more complex since, for example, varying the name of the instructor of MCS-014 would need that all tuples having MCS-014 enrolment information be updated. If for some reason, all tuples are not updated, we may have a database that gives 2 names of instructor for the subject MCS-014 which is inconsistent information. This problem is known as update anomaly. An update anomaly results in data inconsistency.
a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
How can you map NULL values to other values while display? IF( ) , IFNULL( ) keywords are used to do so. They are 'LIMIT' is used for the following kinds of problems: 1) Ans
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Why is database design important?
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Define physical image of a global relation at a site
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Automated system for appointment with sms and call confirmation with service providers and user has to be initiate automatically. After selecting time and date to use service, s
Explain the rules for creating a labelled precedence graph for testing view serializability. Ans: A schedule S is view serializable if it is view equivalent to a ser
What is a candidate key? Minimal super keys are known as candidate keys.
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