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: 63% (11 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...
-
Lead in drinking water. The U.S. Environmental Protection Agency (EPA) sets a limit on the amount of lead permitted in drinking water. The EPA Action Level for lead is .015 milligram per liter (mg/L)...
-
Using examples in this book or online, describe a project that suffered from scope creep. Could it have been avoided? How? Can scope creep be a good thing? When? What can organizations do to...
-
James Albemarle created a trust fund at the beginning of 2016. The income from this fund will go to his son Edward. When Edward reaches the age of 25, the principal of the fund will be conveyed to...
-
A merchandiser plans to sell 12.400 units next month at a seling price of $110 per unit. It also gathered the following cost estimates for next month Cost Cost Formula Cost of goods sold $ 60 per...
-
A 400 N sphere is resting in a trough as shown in fig. 1. Determine the reactions developed at contact surface. 60 450 Fig.1
-
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:...
-
How are responsibility accounting and decentralization related? LO1
-
Part 2 One Stop Electrical Shop are merchandisers of household fixtures & fittings. The business began the last quarter of 2020 (October to December) with 25 Starburst Wall Clocks at a total cost of...
-
A species of butterfly has three subspecies A, B, and C. A scientist is trying to classify observed. specimens into these subspecies based on the color of their wings, which can be blue, green, pink,...
-
Stock during the year were sold for $8 per share. On December 31 , Portland had no remaining treasury stock. Required: Prepare the necessary journal entries to record any transactions associated with...
-
2) 20 pts. A 2-kg block rests on a wedge that has a coefficient of friction between the wedge and block of 0.3. The system accelerated to the right. Determine the maximum acceleration of the system...
-
ABC Ltd. is concerning about its poor performance and considering whether or not dropping the production and sells of product R, which incurs losses of Birr 4000. Additional information: The salaries...
-
(A) Potassium crystallizes in the bcc structure. What is the length of the unit cell in this structure? Use the metallic radius of potassium given in Figure 9-11. (B) Aluminum crystallizes in an fcc...
-
Find the equations of the ellipses satisfying the given conditions. The center of each is at the origin. Passes through (2, 2) and (1, 4)
-
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...
-
Glencove Company makes one model of radar gun used by law enforcement officers. All direct materials are added at the beginning of the manufacturing process. Information for the month of September...
-
Larren Buffett is concerned after receiving her weekly paycheck. She believes that her deductions for Social Security, Medicare, and Federal Income Tax withholding (FIT) may be incorrect. Larren is...
-
The major justification for adding Step 0 to the U.S. GAAP impairment test for goodwill and indefinite lived intangibles is that it: A. Saves money spent estimating fair values B. Results in more...
Study smarter with the SolutionInn App