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Define data model?
A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
Determine the term- Active values An active value is that has dependent values. Every dependent value registers itself with active value that contains a set of dependent values
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
a set of possible data value of an attribute is called??
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.
What is Relational Algebra? Relational algebra is a Procedural query Language?
What is an ERD?
Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
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