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Define an abstraction by which relationships are treated as higher level entities
Ans: Aggregation.
It is an abstraction by which relationships are treated as higher level entities Aggregation. (In ER diagram, aggregation is utilized to denote a relationship as an entity set.)
What is assertion? Mention the forms available. An assertion is a predicate expressing a condition that we wish the database always to satisfy. Domain integrity constraints.
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
project on dbms
Define and differentiate between ordered indexing and hashing. Ans: Ordered indexing: To gain fast random access to records in a file, we can make of an index structure. Every
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What is the use of a slotted-page structure and what is the information are there in the header? The slotted-page structure is used for organizing records within a one block.
What are the benefits of decomposing a system? The benefits of decomposing a system into subsystems are that after decomposition, each individual component become smaller and e
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