Question: SQL allows relations with duplicates. a. Define versions of the basic relational-algebra operations , , , , , , and that work on relationswith

SQL allows relations with duplicates.

a. Define versions of the basic relational-algebra operations σ, Π, ×, Π, −, ∪, and ∩ that work on relationswith duplicates, in a way consistent with SQL.

b. Check which of the equivalence rules 1 through 7.b hold for the multiset version of the relational-algebra defined in part a.

Step by Step Solution

★★★★★

3.44 Rating (170 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a We define the multiset versions of the relationalalgebra operators here Given multiset relations r ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

16-CS-DB (309).docx

120 KBs Word File

Students Have Also Explored These Related Databases Questions!

Define the five basic relational algebra operations. Define the Join, Intersection, and Division operations in terms of these five basic operations.

Define three equivalence relations on the set of buildings on a college campus. Determine the equivalence classes for each of these equivalence relations.

Which relational algebra operators can be applied to a pair of tables that are not union-compatible?

Reference: FOSSUM.. Labor Relations, 10th Edition. McGraw-Hill Learning Solutions, 2008. VitalBook file. Page 429Chapter Thirteen Union-Management Cooperation Many labor relations practices are...

Hi Sirs, I need your help. This assignment due date is next week thursday (30/03/2017). The instructions are as in the attached doc. and also the Companies which will be used for it are attached...

Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...

What is the working capital, current ratio, and quick ratio of Intuit? Please use the attached annual report. Frequently, management will comment on liquidity in the MD&A (management's discussion and...

Hi there! One more question for you. Similar to my last one. I have to have it done by tonight. Let me know if you cannot do it. Here it is: Scenario 3 May I Propose To... You are a partner in a...

You are a partner in a prestigious accounting firm, and you just received requests for proposal from two companies; Advanced Micro Devices, and Facebook. The deadline for the proposals is, as is...

Hi there! One more question for you. Similar to my last one. I have to have it done by tonight. Let me know if you cannot do it. Here it is: Scenario 3 May I Propose To... You are a partner in a...

An examination is designed where the students are required to answer any 20 questions from a group of 25 questions. How many ways can a student choose the 20 questions?

Northern purchased all of Southern's business, including all of its assets and liabilities, for $652,750. Information related to the two companies is shown below: Northern Southern Fair value of...

Provide examples of scenarios where you could utilise the 2 test to examine possible differences in the proportions of more than two independent populations.

Consider the potato chip production process at a company such as Frito-Lay . Frito-Lay uses a continuous flow technology that is suited for high volumes of product. At the Plano, Texas, facility,...

Southern Atlantic Distributors began operations in January 2011 and purchased a delivery truck for $40,000. Southern Atlantic plans to use straight-line depreciation over a four-year expected useful...

Production equipment maintenance, sales commissions, and process design costs are part of a companys costs. Identify which of these costs are most likely direct, indirect, and unallocated with...

Frame the initial issue(s) arising from the following facts. What additional information would be helpful? a. Taxpayer purchases a ticket for the New Jersey lottery. He won $ 1,000. b. Taxpayer paid...

Cambridge Tool Co. is a supplier that assembles purchased parts into components for three distinct marketsscooter parts, lawn mower parts, and hand tool parts. Following is the statement of operating...

Griegs Supermarket is a small western Canada chain of supermarkets that has been in operation for 50 years. The store in the case employs about 150 people, 40% of whom are part-time. The current...

What is the difference between a database and a table?

A database user manual notes that, The file contains two hundred records, each record containing nine fields. Use appropriate relational database terminology to translate that statement.

What is the difference between a false positive and a false drop? If it is essential that no relevant information be missed by an information retrieval query, is it acceptable to have either false...

Discuss each of the following terms: a. Data b. Field c. Record d. File

What is data redundancy, and which characteristics of the file system can lead to it?

Sample size calculations: The research question is whether there is a difference in the efficacy of Study drug A and Study drug B (which is the standard of care) for the treatment of type 2 diabetes....