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Explain Candidate Key and Super Key
A super key is a set of one or more than attributes that, taken collectively, permits us to identify uniquely a tuple in the relation. Whereas a candidate key is a minimal superkey that can be used to uniquely identify a tuple in the relation. In superkey, there may a few extra attributes.
Define the Query optimisation The query parser commonly generates a standard initial tree to correspond to an SQL query, with no doing any optimization. Such type of a canonica
exercise solution
What is called a query -execution engine? The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.
What is system catalog or catalog relation? How is better known as? A RDBMS maintains a explanation of all the data that it contains, information about every relation and index
Explain the Relational Completeness Codd described the term relational completeness to consider to a language that is complete with respect to first-order predicate calculus ex
Consider employee (e_no, e_name, e_salary, d_code), dept (d_code, d_name) and dependent (depndt_name, e_no, relation). Show the names of employees in purchase and accounts departm
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
Which method is used to key transformation ? A hash method is used to key transformation.
Object-based Models: Use objects as key data representation components . Examples:- Entity-Relationship Model: It is a collection of real world objects known as entitie
WHAT IS DBMS
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