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Event
Occurrence of a process is called event. In other words, the object can receive many input instructions. The changes which occur due to these instructions are known as events. For example, tossing a coin is input, but appearance of either HEAD or TAIL is an event.
What are domain constraints? A domain is a set of values that might be assigned to an attribute .all values that appear in a column of a relation must be taken from the similar
why are older data models are being replaced by new data models
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Explain Record Based Logical Models? Record-Based logical Models: Also define data at the conceptual and view levels. Unlike object-oriented models, are used to state overall
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
What is Derived and stored Attribute? Derived and Stored Attribute - In a few cases, two or more attribute values are associated, for example, Age and BirthDate attributes of a
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
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