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...
-
Observe an organization with which you are familiar. List three decisions it makes in each of the following categories: strategic planning, management control (tactical planning), and operational...
-
\(4-(6+3) \times 5+11\) Perform the indicated calculation.
-
Friendleys Miniature Golf and Driving Range Inc. was opened on March 1 by Dean Barley. These selected events and transactions occurred during March. Mar. 1 Stockholders invested $50,000 cash in the...
-
Tawana owns and operates a sole proprietorship and has a 37 percent marginal tax rate. She provides her son, Jonathon, $6,500 a year for college expenses. Jonathon works as a pizza delivery person...
-
Compute ending merchandise inventory and cost of goods sold for Synergy using the weighted- average inventory costing method. The periodic inventory records of Synergy Prosthetics indicate the...
-
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...
-
A company is evaluating two mutually exclusive projects. Both require an initial investment of $240,000 and have no appreciable disposal value. Their expected profits over their five-year lifetimes...
-
Explain the difference between the balanced scorecard and the strategy map. State the two questions the strategy map serves to answer.
-
1. The police had probable cause to believe Charlie had a stolen laptop computer in his car. The police stopped Charlie's car and searched it without a warrant. In the trunk, they found the stolen...
-
If a trial balance is showing a Cash account with a credit balance of $2,340, What does it means.
-
On Jan 1, you sold short 100 shares of Apple stock at $140 per share. On March 1, a dividend of $2 per share was paid. On April 1, you covered the short sale by buying the stock at a price of $120...
-
Wildhorse Company has a unit selling price of $720, unit variable costs of $380, and fixed costs of $196,520. Compute the break-even point in sales units using (a) the mathematical equation and (b)...
-
A sample of size n = 89 has sample mean x = 87.2 and sample standard deviation s = 5.3. a. Construct a 95% confidence interval for the population mean . b. If the confidence level were 99%, would the...
-
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...
-
Technical progress will: O a. shift a firm's isoquant outward and cost curves downward O b. shift a firm's isoquant inward and cost curves upward c. shift a firm's isoquant inward and cost curves...
-
The figure to the right represents the cost structure for a perfectly competitive firm with its average total cost (ATC) curve, average vanable (AVC) curve, and marginal cost (MC) curve Fixed costs...
-
Question 39 Aggregate demand will decrease if: O the money supply increases. O the government raises tax rates. the aggregate price level falls. productivity declines.
Study smarter with the SolutionInn App