Consider the SQL query select p.a1 from p, r1, r2 where p.a1 = r1.a1 or p.a1 =
Question:
Consider the SQL query select p.a1 from p, r1, r2 where p.a1 = r1.a1 or p.a1 = r2.a1. Under what conditions does the preceding query select values of p.a1 that are either in r1 or in r2? Examine carefully the cases where one of r1 or r2 may be empty.
Fantastic news! We've Found the answer you've been seeking!
Step by Step Answer:
Answer rating: 70% (10 reviews)
The query selects those values of pa1 that are equal to some v...View the full answer
Answered By
Charles mwangi
I am a postgraduate in chemistry (Industrial chemistry with management),with writing experience for more than 3 years.I have specialized in content development,questions,term papers and assignments.Majoring in chemistry,information science,management,human resource management,accounting,business law,marketing,psychology,excl expert ,education and engineering.I have tutored in other different platforms where my DNA includes three key aspects i.e,quality papers,timely and free from any academic malpractices.I frequently engage clients in each and every step to ensure quality service delivery.This is to ensure sustainability of the tutoring aspects as well as the credibility of the platform.
4.30+
2+ Reviews
10+ Question Solved
Related Book For
Question Posted:
Students also viewed these Computer Sciences questions
-
Under what conditions does there exist a linear function L: R2 R2 such that Under what conditions is L uniquely defined? In the latter case, write down the matrix representation of L. LG)-6) and...
-
Under what conditions does a company anticipate price declines?
-
Under what conditions does product modification work best?
-
Do firms follow the same steps for impairment testing of finite- and indefinite- life intangible assets ? Explain.
-
Jake Spahr is evaluating a business opportunity to sell premium car wax at vintage car shows. The wax is sold in 64-ounce tubs. Jake can buy the premium wax at a wholesale cost of $32 per tub. He...
-
For monthly recordings since 1909, let B be the mean sea level at The Battery, New York, and let G be the mean sea level at Galveston, Texas, both in feet. For mean sea levels at The Battery between...
-
Based on the design, briefly discuss the data collection procedures to be used. Be sure to include the area rea of focus and targeted sample as part of these procedures. Develop a hypothetical...
-
In the new system under development for Holiday Travel Vehicles, seven tables will be implemented in the new relational database. These tables are New Vehicle, Trade-in Vehicle, Sales Invoice,...
-
n Juods xi(yi - Bxi) = 0 n i=1 a) Step by step, solve for B (Hint: you may want to use the proof starting on pg 10 as your guide)
-
1.Discuss some types of queries for which renaming of attributes is necessary in order to specify the query unambiguously. 2.Discuss the various types of JOIN operations. Why is theta join required?...
-
Consider the relational database of Figure. Using SQL, define a view consisting of manager-name and the average salary of all employees who work for that manager. Explain why the database system...
-
Write an SQL query, without using a with clause, to find all branches where the total account deposit is less than the average total account deposit at all branches, a. Using a nested query in the...
-
The future worth of alternative B is closest to: (a) $85,000 (b) $750,000 (c) $850,000 (d) Problem is based on the following cash flows for alternatives A and B at an interest rate of 10% per year....
-
identify two areas in healthcare that might benefit significantly from artificial intelligence (AI) and why?
-
Budgetary Costs Estimate the total cost of the initiative. Explain the direct and indirect costs associated with the budget. Include direct and/or indirect expenditures and their associated costs...
-
According to Gido and Clement (2015:287), another approach to identify risks of a project is to establish risk categories. Identify and appraise the risk categories. Thereafter, identify and...
-
Identify which technological tools you plan to use for your organization and explain why?
-
What is the purpose of a Literature Review? How is a Literature Review different from a Webliography or collection of articles? What are key points to remember in writing a Literature Review? Why is...
-
Describe three steps progressive marketers take to improve the quality of their prospecting effort.
-
What types of inventory issues Starbucks might reflect upon at the end of each year? The mission of Starbucks is to inspire and nurture the human spiritone person, one cup, and one neighborhood at a...
-
An antibiotic drug is contained in a solid inner core and is surrounded by an outer coating that makes it palatable. The outer coating and the drug are dissolved at different rates in the stomach,...
-
Write pseudocode for an iterator that implements indexed nested-loop join, where the outer relation is pipelined. Your pseudocode must define the standard iterator functions open(), next(), and...
-
Suppose you need to sort relation r using sort-merge and mergejoin the result with an already sorted relation s. a. Describe how the sort operator is broken into sub operators to model the pipelining...
-
Give conditions under which the following expressions are equivalent: where agg denotes any aggregation operation. How can the above conditions be relaxed if agg is one of min or max? A,BY agg(C) (E...
-
In which one of the following lists are ALL items relevant to the determination of employment income? Employee RPP contributions; signing bonus on accepting employment; use of an employer - owned...
-
what is the shortest maturity bond issued by pfizer that is outstanding?
-
Manufacturing Company Balance Sheet Partial balance sheet data for Diesel Additives Company at August 31 are as follows: Finished goods inventory $89,400 Prepaid insurance 9,000 Accounts receivable...
Study smarter with the SolutionInn App