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last post by:
I need to write a relational algebra query for the following:
Show the item_ID, item description and category description for all items
where the supplier uses "rail" as the delivery_method.
The relations (tables) and attributes are as follows:
Item (item_ID, description, category, price, qty_on_hand)
Category (code, description, tax_rate)
Supplied_by (item_ID, supplier, date, delivery_method)
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by: trippedwire |
last post by:
i have entity sets
account(account-number, balance)
branch(branch-name, branch-city, assets)
customer(customer-name, customer-street, customer-city)
loan(loan-number, amount)
and relationship sets
account-branch(account-number, branch-name)
depositor(customer-name, account-number)
borrower(customer-name, loan-number)
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by: Vishy8015 |
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Use Relational Algebra to express the following queries on the schema FLIGHTS (DepartureCity, ArrivalCity). A pair of cities a, b is in an instance of relation FLIGHTS if there is a direct flight from city a to city b. The relation is always antireflexive: that is, there are no flights from a city to itself.
a) Cities with flights to all cities from which there is exactly one flight.
b) Cities with flights to exactly all cities from...
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by: scorpiomailin |
last post by:
Hello Guys...
thanks in advance jst wondering if any1 knows answer to this....
if this is the SQL query
Author(name, hometown, publisher)
Textbook(tname, aname, price)
select A.name, publisher from Author A, Textbook T
where T.aname = A.name and not exists (select * from Textbook S
where S. price > T.price);
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by: lava4112 |
last post by:
Have a test on SQL, only teacher wants to know what type of relational algebra is a select, where, from--I have no idea and can not understand the teacher.
We are using Concepts of Database Management by Pratt
No I understand quieries, but not relational algebra
Any Help would be great
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by: aiom |
last post by:
following are the given set of relations
:
STUDENT(SSN,Name,Major,Bdate)
COURSE(Course#,CName,Dept)
EnrollCourse#,Quarter,Grade)
BOOK_ADOPTION(Course#,Quarter,Book_ISBN)
TEXT(Book_ISBN,Book_Title,Publisher,Author)
List any department that has all its adopted books publiched by 'ABC Publishing' in relational algebra.
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by: muniba |
last post by:
Relational algebric expression for the following:
Draw two relational algebra query trees for the following query and show that one query tree is more eficient than the other.
"Give the number of treatments given by "Dr.Albert" for all the appointments made during the period January to June 2007"
thanks
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by: Metallicat |
last post by:
I have been posed and attempted to answer several questions but I do not seem to be getting anywhere. I have emailed my tutor a week ago and he has not responded, If anyone can take a look and help me out I would be grateful.
Two of the questions are below, if anyone can help with these two I'm sure that I can crack the rest!
Find the first name, surnames and address of the patients that have had at least one operation with broken bones. ...
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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