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What are object interaction diagrams?
Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation, and this information is used as guidance for implementation of the individual operations.
The External or View Level The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see
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a brief definition
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
Define Thomas write rule Thomas' write rule: The Thomas' write rule is a modification of timestamp-ordering protocol for concurrency control. Assume that transaction T i issue
Differance between Unordered and ordered file ? Unordered file do no has any sequence although ordered file has arranged in a few sequence and data are assigned in ordered form
Explain Composite attribute in SQL ? Composite attribute: A composite attribute has many components, each of that is atomic or composite.
Benefits and limitations
Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan
as a customer service employee explain five measures you would recommend to make even a displeased students patronize the school canteen
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