Question: Given the database schema R (a, b, c), and a relation r on the schema R, write an SQL query to test whether the functional

Given the database schema R (a, b, c), and a relation r on the schema R, write an SQL query to test whether the functional dependency b → c holds on relation r. Alsowrite an SQL assertion that enforces the functional dependency. Assume that no null values are present.

Step by Step Solution

★★★★★

3.40 Rating (175 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a The query is given below Its result is nonemp... 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 (190).docx

120 KBs Word File

Students Have Also Explored These Related Databases Questions!

Write an SQL query to list each customer who bought at least one product that belongs to product line Basic in March 2015. List each customer only once.

Write an SQL query to list each customer who has bought computer desks and the number of units sold to each customer. Show how you constructed this query using a Venn or other type of diagram.

Write an SQL query to produce a list of all the products (i.e., product description) and the number of times each product has been ordered. Show how you constructed this query using a Venn or other...

? 1. SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions. 2. For a relation schema R (A, B, C, D), if AB -> C...

This is how we have to do it according to the slides: Question 1 Given is the relational schema R= (A, B, C, D, E) and the set of functional dependencies F = {AB BC, C + A, ABC + D). Is R in BCNF? If...

This is how we have to do it!: Question 3 Given is the relational schema R= (A, B, C, D, E) and the set of functional dependencies F = {AB BC, C + A,BC D}. Is R in 3NF? If not, give a lossless and...

This is how we have to do it!: Question 2 Given is the relational schema R= (A, B, C, D, E) and the set of functional dependencies F = {AB BC,C A, ABC D}. Is R in 3NF? If not, give a lossless and...

Consider a relation schema R = (A, B, C, D, E) and a set F consisting of the following functional dependencies that hold on R: A -> C, AC -> E, AD -> B, B -> ADE, D-> E. An algorithm for computing a...

Database plzzzzz be fast Problem 1: T/F (20 points) 1. SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions. 2....

Database plz be fast Problem 1: T/F (20 points) 1. SQL provides the AS keyword, which can be used to assign meaningful column names to the results of queries using the SQL built-in functions. 2. For...

In 2010, EZ-Learn Software developed a software package for assisting calculus instruction in business colleges, at a cost of $2,000,000. Although there are tens of thousands of calculus students in...

Given f = -97 +33 and c = 47 +33, find f +1 and 1f1 + l. Give EXACT answers. Do NOT need to simplify your radicals! If + c = 1f1 + 11 =

Which of the following is a system or application testing that confirms to the end - users that all of their stated requirements have been correctly implemented system being tested? A Acceptance...

What are the key factors for future competitive success. List the common types of key success factors, and answer the following questions: On what basis do buyers of the industrys product choose...

True or False Whether the distribution of the mean of a large number of independent, identically distributed variables will be approximately normal depends on the underlying distribution.

Describe the surface whose equation is given. x 2 + y 2 + z 2 + 6x + 10y + 8z - 14 = 0 Surface description: ? Center: (x, y, z) = ? Radius = ?

Find an equation of the largest sphere contained in the cube determined by the planes x=8, x=-4, y=-2, y=10, z=-3, and z=9

A cast iron hollow column of 200 mm external diameter and 160 mm internal diameter is 4 m long. It is fixed at its both ends and subjected to an eccentric load of 150 kN. Determine the maximum...

What is the mass of a 1.75 L sample of a liquid that has a density of 0.921 g/mL? a) 1.61 * 10 3 g b) 1.61 * 10 -3 g c) 1.90 * 10 3 g d) 1.90 * 10 -3 g

Consider the insurance database of Figure 3.17, where the primary keys are underlined. Construct the following SQL queries for this relational database. a. Find the number of accidents involving a...

Consider the employee database of Figure 3.19. Give an expression in SQL for each of the following queries. a. Give all employees of First Bank Corporation a 10 percent raise. b. Give all managers of...

Show that, in SQL, all is identical to not in.

Give an SQL schema definition for the employee database of Figure 3.19. Choose an appropriate domain for each attribute and an appropriate primary key for each relation schema. Include any...

Rewrite the where clause where unique (select title from the course) without using the unique construct.

The technique for calculating a bid price can be extended to many other types of problems. Answer the following questions using the same technique as setting a bid price; that is, set the project NPV...