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What are the objectives of query processing?
Ans: The objectives of query processing is to transform a query written in a high level language into a accurate and efficient execution strategy expressed in a low level language and implement the strategy to retrieve the data.
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
Explain view in RDBMS? View - A view is a relation (virtual rather than base) and could be used in query expressions, which is, queries can be written by using the view as a re
What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s
does tables are called relations
Why Like predicate used for? LIKE predicate: The LIKE predicate searches for strings in which have a certain pattern.
Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
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