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Hierarchical model is also known by?
A hierarchical model is also known as a Tree structure.
Making Common Behaviour Abstract Let us define abstraction "Abstraction means to focus on the necessary, inherent aspects of an entity and ignoring its accidental features". O
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
Views in relational algebra: 1. Basic expression contains either a) A relation in the database. b) A constant relation. 2. General expressions are madde out of sma
What are the advantages of creating a table from existing table?
Synonyms and Indexes Some of the essential properties of indexes are: An Index is a schema Object Indexes can be formed explicitly or automatically Indexes are m
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
non numeric literals
Define Signal. It allows methods to respond to events triggered by themselves or by other processes. Each signal corresponds to an exacting event. A signal is represented in Sy
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