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Objectives
After reading this part, you should be able to:
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
what is definition hierarchical data model
List any two disadvantages of a database system ? The disadvantages of database system are: • Database systems are difficult, complex, and time-consuming to design. • Substanti
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
What is meant by mean time to failure? The mean time to failure is the amount of time that the system could run continuously without failure.
Define the term- Actors and Data Stores Actors: An actor is the active object which drives data flow graph by producing or consuming values. Actors are attached to inputs a
Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
BCNF Boyce-Codd Normal Form A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relati
I need help for my Uni assignments
Explain the concept of a data model ? Data Model - Model is an abstraction procedure which hides irrelevant details although highlighting details relevant to the application
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