Question: For each of the SQL aggregate functions sum, count, min and max, show how to compute the aggregate value on a multiset S1 S2,

For each of the SQL aggregate functions sum, count, min and max, show how to compute the aggregate value on a multiset S1 ∪ S2, given the aggregate values on multisets S1 and S2.

Based on the above, give expressions to compute aggregate values with grouping on a subset S of the attributes of a relation r (A, B, C, D, E), given aggregate values for grouping on attributes T ⊇ S, for the following aggregate functions:

a. sum, count, min and max

b. avg

c. standard deviation

Step by Step Solution

★★★★★

3.32 Rating (164 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Answer Given aggregate values ... 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 (423).docx

120 KBs Word File

Students Have Also Explored These Related Databases Questions!

Compute un-weighted aggregate price index numbers for each of the given years using 2009 as the baseyear. Item 20092010 2011 20122013 3.21 .51 83 1.30 1.67 62 3.37 .55 90 1.32 1.72 67 3.80 68 91 1.33...

Compute s2, and s for each of the data sets listed. Where appropriate, specify the units in which your answer is expressed. a. 3, 1, 10, 10, 4 b. 8 feet, 10 feet, 32 feet, 5 feet c. 1, 4, 3, 1, 4, 4...

Give the IUPAC name for each of the following alkyl groups, and classify each one as primary, secondary, or tertiary: (a) CH3 (CH2)10CH2 (b) CH2CH2CHCH2CH2CH3 W CH2CH3

Story plot: tall, square, symmetric. For each technique, give the relevant matrix equations to obtain the solution x, and point out the properties of the matrices involved. Highlight one potential...

SQL Query Question. Use the PVFC database if you have it. These are my notes: RETRIEVE ALL COLUMNS AND ROWS select * from product_t select * from employee_t select * from order_t RETRIEVE INDIVIDUAL...

Three alternative representations for non-negative integers, n, are: Peano: values have the form S(... S(Z) ...), applying S n times to Z where S and Z are constructors or constants of some data...

SQL sublanguage: DQL ( Data Query Language ) * * Aggregate functions in SQL are functions which preform operations on multiple rows to produce a single output. * For instance, COUNT ( ) is an...

Top of Form Q1 Which of the following is a valid aggregate function in SQL? Check only those that apply. Question 1 options: AVG LEAST COUNT MIN MOST SUM Q2 Which of the following aggregate functions...

/*Please answer the Queries and display the code and output.*/ This assignment focuses on the use of the aggregate functions. These functions combine all the results to perform a statistical...

Question 1 (3 points) Which of the following is a valid aggregate function in SQL? Check only those that apply AVG MIN MOST SUM LEAST COUNT Question 2 (3 points) Which of the following aggregate...

Simply Shine Shampoo is manufactured in two departments: Mixing and Packing. Once the shampoo mixture is completed in the Mixing Department, it is sent to Packaging, where a machine fills and seals...

An underground storage cavity is excavated in a massive salt formation by solution mining. Depth to the center of the cavity is 1,340 ft (408 m). Borehole surveying shows the cavity has the shape of...

Explain what is meant by the term IS security and describe both technologyand human-based safeguards for information systems.

On February 28, 2018, Molega Ltd.'s general ledger contained the following liability accounts: Accounts payable...............................$42,500 CPP...

In each of the following independent situations, determine the DPAD for 2017 for the corporation involved. ayer W-2 Wages TI QPAI a. White Red Black $800,000 400,000 $600,000 $120,000 20,000 b....

For 2017, Gold Corporation (a calendar year business) had the following transactions: Taxable income............................................................................$4,200,000 Accelerated...

A sample of size 100 is selected from a population with p = .40. a. What is the expected value of ? b. What is the standard error of ? c. Show the sampling distribution of . d. What does the sampling...

The National Football League (NFL) polls fans to develop a rating for each football game (NFL website, October 24, 2012). Each game is rated on a scale from 0 (forgettable) to100 (memorable). The fan...

Discuss four alternative work arrangements that impact the work-family balance.

What is a Web application server, and how does it work from a database perspective?

What is XML, and why is it important?

Should you create an index? If so, what would the index column(s) be, and why should you create that index?

What type of I/O database operations would be most likely to be used to execute that query?

How should you rewrite the query to ensure that it uses the index you created in your solution to Problem 25?

Archer, A . L . , & Hughes, C . A . ( 2 0 1 1 ) . Explicit instruction: Effective and efficient teaching. New York, NY . Guilford Press.