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Which database level is closest to the users?
External database level is closest to the users.
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
what is stracture of dabms
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
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the delet
what are the limitations of dbms?
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
explain cascading rollback
Differentiate between a Global and a Local temporary table? - A local temporary table exists only for the duration of a connection or if defined inside a compound statement, fo
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