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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
Demonstrate the UML model Using UML, it is possible to generate code in any of the programming language from UML model (called forward engineering) and rebuild a model from an
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
SELECT Statement This statement is used for retrieving information from the databases. It can be coupled with many clauses. Let us talk about these clauses in more detail:
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
what is definition hierarchical data model
Which data type can store unstructured data? Raw data type can store unstructured data.
Physical Records These are the records that are stored in the secondary storage devices. For the database relation, physical records are the group of fields kept in adjacent me
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