What is an unsafe query? Give an example and explain why it is important to disallow such
Question:
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 60% (10 reviews)
An unsafe query is a query in relational calculus that has an infinite number of results A...View the full answer
Answered By
Geoffrey Isaboke
I am an industrious tutor with a 5-yr experience in professional academic writing. I have passion for History and Music and I have good knowledge in Economics
5.00+
2+ Reviews
10+ Question Solved
Related Book For
Database management systems
ISBN: 978-0072465631
3rd edition
Authors: Raghu Ramakrishan, Johannes Gehrke, Scott Selikoff
Question Posted:
Students also viewed these Computer Sciences questions
-
Describe the open-items list and explain why it is important.
-
Using OLAP Query 1 shown in Figure 9.11 (based on data from Figure 9.7) as a starting point, give an example that illustrates a pivot operation.
-
Using OLAP Query 1 shown in Figure 9.11 (based on data from Figure 9.7) as a starting point, give an example that illustrates a slice and dice operation.
-
Explain impact of IT on cross border communication and how to manage cross cultural business communication successfully.
-
During the 1980s and 1990s, changes in the S&P 500 (a broadly diversified index of U.S. stocks) were about 50% correlated with the MSCI EAFE Index (a broadly diversified index of European and other...
-
The percentage composition of acetaldehyde is 54.5% C, 9.2% H, and 36.3% O, and its molecular mass is 44 amu. Obtain the molecular formula of acetaldehyde.
-
The output of a single-mode, well-stabilized laser is passed through a spatially distributed phase modulator (or a phase-only spatial light modulator that is changing with time). The field observed...
-
Petit Industries has $100,000 to invest. The company is trying to decide between two alternative uses of the funds. The alternatives are: The working capital needed for project B will be released at...
-
Please help and provide a detailed explanation of the Burj Khalifa's structural system, including its materials, foundations, soil resistance, beams, frames, structural behavior, and aesthetics.
-
This case examines the 2012 share repurchase decision of greeting card company American Greetings. At the time of the decision, American Greetings stock is trading at valuation multiples that are the...
-
Consider the Supplier-Parts-Catalog schema from the previous question. State what the following queries compute: 1. sname(sid((color = 'red' Parts) (cost <100Catalog)) Suppliers) 2....
-
Consider the following relations: Student(snum: integer, sname: string, major: string, level: string, age: integer) Class(name: string, meets at: string, room: string, fid: integer) Enrolled(snum:...
-
Using data from the National Health Survey, the equation of the best-fit line for women's heights and weights is obtained, and it shows that a woman 120 inches tall is predicted to weigh 430 pounds.
-
If 1 of the 839 challenges is randomly selected, find the probability of getting a challenge that was rejected. Use the following results from the 839 player challenges to referee calls in the first...
-
Find the probability of randomly selecting 2 different challenges and finding that they were both accepted challenges made by female players. Use the following results from the 839 player challenges...
-
Find the probability of randomly selecting 1 of the 839 challenges and getting a challenge that was accepted and was made by a female player. Use the following results from the 839 player challenges...
-
If 1 of the 839 challenges is randomly selected, find the probability of getting a challenge that was made by a male player or was rejected. Use the following results from the 839 player challenges...
-
Find the probability of being sentenced to prison, given that the subject entered a plea of guilty. Use the data in the accompanying table based on data from Does It Pay to Plead Guilty? Differential...
-
Anthony is going to drive a flat-bed truck up a hill that makes an angle of 10 with respect to the horizontal direction. A 36.0 kg package sits in the back of the truck. The coefficient of static...
-
For Problem estimate the change in y for the given change in x. y = f(x), f'(12) = 30, x increases from 12 to 12.2
-
Consider the insurance database of Figure, where the primary keys are underlined. Construct the following QBE queries for this relational-database. a. Find the total number of people who owned cars...
-
Consider the employee database of Figure. Give expressions in QBE, and Datalog for each of the following queries: a. Find the names of all employees who work for First Bank Corporation. b. Find the...
-
Consider the relational database of Figure where the primary keys are underlined. Give expressions in QBE for each of the following queries: a. Find all employees who earn more than the average...
-
Explain organizational change and briefly discuss the three types of change? ( 350 words please)
-
Identify an organization that has experienced change Classify the type of organizational change the organization experienced Describe how the organization overcame the resistance to the change...
-
Carlton Bank has an increase in reserves of $1,000,000. If the reserve ratio is 10%, by what amount may Carlton increase its demand deposits?
Study smarter with the SolutionInn App