Write a query to find name from the relational algebra, Database Management System

Assignment Help:

Consider the relations
City (city_name, state)
Hotel (name, address)
City_hotel (hotel_name, city_name, owner)

Answer the following queries in relational algebra
(i) Find out the names and address of hotels in Agra.
(ii) List the names of cities that have no hotel.
(iii) List the names of the hotels owned through ‘Taj Group'.

Ans: (i) Π name, address ( σ city_name= ‘Agra' (Hotelname=city_name City_hotel))
(ii) Π city_name (City) - Π city_name(City_hotel)
(iii) Π hotel_name ( σ owner='Taj Group' (City_hotel))


Related Discussions:- Write a query to find name from the relational algebra

Define check point and its impact on data base recovery, Define check point...

Define check point and its impact on data base recovery.                  Ans:  There could be hundreds of transactions handled per minute, in a large on-line database system.

Bid Cunt, How do I use strap on?#

How do I use strap on?#

Difference between a composite key and attribute, Question: (a) Discuss...

Question: (a) Discuss the difference between a composite key and a composite attribute. How would each be indicated in an E-R diagram? Support your answer with appropriate exam

Database Management System, please give me introduction to full data in D B...

please give me introduction to full data in D B M S in a short assignment

Inheritance, what is relationship inheritance and attribute inheritance

what is relationship inheritance and attribute inheritance

Sql, Events4Fun is an event management company in Europe with branches in S...

Events4Fun is an event management company in Europe with branches in South America as well. The company is well-known for its efficiency, good-quality services, and affordable char

BI, (a) Why did SAP introduce the extended star schema?

(a) Why did SAP introduce the extended star schema?

What is the candidate key for a table with columns, For problems 1-4, give ...

For problems 1-4, give all candidate keys for the tables with FDs specified.  Composite candidate keys must be put in parentheses, and candidate keys must be separated with commas

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd