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(a) Provide the description of the following ODMG schema in the Object Definition Language (ODL).
(b) Based on the above object database, write the following queries in the Object Query language (OQL):
Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the
Define identify relationship? Identifying relationship: An identifying relationship means in which the child table cannot be uniquely recognize without the parent. For exampl
find the name of supplier who supply some red part
Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
Benefits and Limitations od Data Models?
Homework chapter 10 no 3
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.
Question: One of the tasks a database management system must perform is to ensure that the data is still intact in the face of software and hardware failure. This task is known
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
how many hourse have been spent on a certain project
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