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For the relations s and r in your study manual of our chapter 2 (i.e., joining two relations), suppose we type a collection of relational algebra queries, and get the following results. A B C D E A 2 a 10 B b 2 a 10 b Please explain how this happened? If you think this result could happen in practice, please write the corresponding relational algebra queries; otherwise, please explain why.
QUESTION 2 40 MARKS 2.1 For the relations s and r in your study manual of our chapter 2 (i.e., joining two relations), suppose we type a collection of relational algebra queries, and get the following results. A B C D E A 2 a 10 B b 2 a 10 b Please explain how this happened? If you think this result could happen in practice, please write the corresponding relational algebra queries; otherwise, please explain why. (4
Computer (vendor, model, machinetype) Model (num, speed, ram, hd, price) Vendor (name, address, phone) Where vendor indicates the manufacturer of a computer, and machine type takes values such as “desktop”, “laptop” and “server”. Underline indicates the primary key. Following inclusion dependencies hold: vendor ⊆ name, and model ⊆ num. Express following queries in relational algebra: A. Find all the vendors who make laptop(s).
We all had the unfortunate experience of seeing how computers can, at times, make life's journey about more difficult. This is especially true in knowledge centric workplaces. Describe an example of a very poorly implemented database that you've encountered (or read about) that illustrates the potential for really messing things up. Include, in your description, an analysis of what might have caused the problems and potential solutions to them. Be sure to provide supporting evidence with citations from the literature.
Should citizens have a choice in whether a smart meter is installed in their homes? 2. Why was testing so important for Yedas? 3. How will smart meters make electricity production more efficient? 4. What are some of the privacy concerns with smart meters?
How many levels of abstraction a typical DB system should hold? What’s the purpose of each of these abstraction levels?
For the relations s and r in your study manual of our chapter 2 (i.e., joining two relations), suppose we type a collection of relational algebra queries, and get the following results. A B C D E A 2 a 10 B b 2 a 10 b Please explain how this happened? If you think this result could happen in practice, please write the corresponding relational algebra queries; otherwise, please explain why.
We have the following database schema: Computer (vendor, model, machinetype) Model (num, speed, ram, hd, price) Vendor (name, address, phone) Where vendor indicates the manufacturer of a computer, and machine type takes values such as “desktop”, “laptop” and “server”. Underline indicates the primary key. Following inclusion dependencies hold: vendor ⊆ name, and model ⊆ num. Express following queries in relational algebra: A. Find all the vendors who make laptop(s). B. Find the phone numbers of all the vendors who make desktops with speed = 2
formulate the following queries in relational algebra question 1.produce a report of book titles that have been borrowed by "peter bloomfield"
Create read only: VIEW_EMPS_NO_SAL show all of the data from employee table, department id, department name from departments table Dont show salary and commission percent employees table. 4. Create a view called: VIEW_COUNTRY_REGION_INFO Show the country id, country name, and region name that each country belongs to. Be sure to use syntax that will allow you to rerun the code without dropping the view and make the view read only. Create READ ONLY view: VIEW_EMP_SAL_INFO Calculate the following: The minimum, average, maximum, and sum of all salaries,a count to show records used. Have calculations grouped by department name. need to join with the departments table Give the read only constraint the name of vw_emp_sal_info_readonly. Run the command to Query the data dictionary USER_VIEWS, showing only the view name and the text columns. Show me the results from your query.
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