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Explain Derived and Non-Derived Attribute?
In few cases, two or more attribute values are related, for instance, Age and BirthDate attributes of a person. For specific person entity, the value of Age can be determined from the current date and the value of that person's BirthDate. Therefore, the attribute Age is known as derived attribute and the attribute BirthDate is known as non-derived or stored attribute.
Have database built but having problems with some questions that go with the database
A Structure of a dependency diagram
Define Assertions in SQL a. An assertion is a predicate that is expressing a condition we wish the database to always satisfy. b. Domain constraints, functional dependency
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
Explain Dynamic Two-Phase Locking Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on
Multilevel Index The Multilevel Index is a modification of the secondary level index system. In this system we might be use even more number of levels in case the table is eve
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
Question: This question refers to the database schema. a) Express the following queries in SQL: (i) Write the SQL code that will create the table Company. Your answer sh
Describe in brief about the Sequence Diagrams Sequence diagrams are interaction diagrams which emphasize time ordering of messages. In UML, it is shown as a table which shows
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
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