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Give the general form of SQL query?
Select A1, A2............., An
From R1, R2..............., Rm
Where P
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
Which is the properties of entities? Attributes is the properties of entities.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
By which techniquesTransaction processing is associated? Transaction processing is associated by producing detail, summary, or exception reports and recording a business activi
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
What is an object ID? Each class-derived table has an ID for primary key, one or more object IDs form primary key for association derived tables. An object ID is equivalent dat
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu
Evaluate, compare and contrast the two methods of relational database design namely top down method and Bottom up method. What will be your choice if you are asked to select a meth
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