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What are the types of reference?explain it with suitable examples?
Object oriented language given the ability to refer the object attribute of the type can be referred to the specified type. We can describe the type dept with a field name and a field head which is reference to the type person and a table dept of the type dept as followed
Create type dept(
Name varchar(20),
Head ref(person)scope people
)
Create table dept of dept
The table definition must state that the reverence is derived and must still state a self referential attribute name. When interesting a tuple for dept we can then use
Insert into dept
Values('CS','john')
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
Function requirement as given: 1> manage fans and likes and followings those information from facebook. twitter. google+ and linkedin etc 2> Organize the clients from email m
how to connect vb.net with access
A field-groups statement or an insert statement reverses storage space and transfers values. False.
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
er diagram of sport
What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
Advantages And Drawbacks Of Ddbms There are various reasons for building distributed database systems, with sharing of data, reliability and availability, and speedup of query
Describe integrity and security? a) Domain constraint b) Referential integrity A value that appears in one relation for a given set of attributes also appear fo
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