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What is the initial step for object-oriented designing
The initial step for object-oriented designing is object modeling. Before we go into deep about object modeling first of all we should know "what is the object modeling"? We can say that Object modeling identifies objects and classes in problem domain and identifies the relationship among objects.
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
Drawbacks of Data Distribution: The primary drawbacks of distributed database systems are the added complexity needed to ensure proper coordination between the sites. This increas
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
WHERE and HAVING clause in SQL ? The WHERE clause is commonly used for implementing conditions on each tuple of the relation. The HAVING clause is used in combination along wi
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
What is meant by Physical blocks? The input and output operations are completed in block units. The blocks residing on the disk are referred to as physical blocks.
explain exhaustively the problems associated with ER diagrams. include illustrations in your answer
Define According to the levels of abstraction, the schema at the intermediate level is called Ans: As per to the levels of abstraction, the schema at the intermediate level is
real life situations where database management system are most suitable
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