Type ISBN eBook RelationName2 (AttrName1) Primary key {AttrName1) Price Book N Order Hardcopy Date Quantity RelationName1 (AttrName1, AttrName2) Primary key {AttrName1} Foreign key {AttrName2} references RelationName2 (AttrName1) M CoverStyle Customer Id Date Name Has Convert the following E-R diagram to a collection of relations. Determine all the primary and foreign keys. Use the following format to answer the question: Payment No

Type ISBN eBook RelationName2 (AttrName1) Primary key {AttrName1) Price Book N Order Hardcopy Date Quantity RelationName1 (AttrName1, AttrName2) Primary key {AttrName1} Foreign key {AttrName2} references RelationName2 (AttrName1) M CoverStyle Customer Id Date Name Has Convert the following E-R diagram to a collection of relations. Determine all the primary and foreign keys. Use the following format to answer the question: Payment No

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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For 1 through 4, state whether the statements are True or False (Do not provide any explanation or comment but only an answer of either True or False) A composite attribute is an attribute that is composed of several attributes. A derived attribute is an attribute whose value is calculated and not permanently stored in adatabase. Every table is a relation. Referential integrity constraint is a rule stating that no primary key column can be optional.
Computer Science At UFL, each class is a specific offering of a course (subject). Each row in the Courses table contains information on a single course or subject taught a UFL and each row in the Classes table contains information on a single offering of a course during a specific term. Investigate the two tables, and then write a query that returns the CourseTitle, ClassID, Term, SectionID and FacultyID for classes taught by FacultyID 5000009. SOLUTION:
The table STUDENT has the attributes STUDENT_ID, NAME, SCHOOL_ID, and ADDR. The table SCHOOL has the attributes SCHOOL_ID, NAME, and STATE_CODE. Assume that there is a 1:N relation between SCHOOL and STUDENT. Which of the following creates a table that shows the STUDENT attributes and the corresponding SCHOOL attributes? a. SELECT * SCHOOL_ID FROM STUDENT JOIN SCHOOL b. SELECT * SCHOOL_ID FROM STUDENT JOIN SCHOOL USING(SCHOOL_ID) c. SELECT * SCHOOL_ID FROM STUDENT NATURAL JOIN SCHOOL d. SELECT * SCHOOL_ID FROM STUDENT, SCHOOL WHERE SCHOOL_ID = SCHOOL_ID
Please help with the folllowing: Consider the following declaration of a relation schema CREATE TABLE R ( A int PRIMARY KEY, B int not null, C char (1) ); Then execution of which of the following queries will fail? QI: Insert INTO R (B, C) Values (353, 'B'); Q2: Insert INTO R (A, C) Values (111, ‘A’); Q3: Insert INTO R (A, B) Values (222, 335); Select one: a. Both QI and Q2 b. QI only c. Both QI and Q3 d. Q2 only
Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the following diagram: The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names: All lower case Underscore separator between root and suffix Foreign keys have the same name as referenced primary key Write CREATE TABLE and ALTER TABLE statements that: Implement the entity as a new phone table. Implement the has relationships as foreign keys in the Sakila customer, staff, and store tables. Remove the existing phone column from the Sakila address table. Step 2 requires adding a foreign key constraint to an existing table. Ex: ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE; Specify data types as follows: phone_id, phone_number, and country_code have data type INT. phone_type has date type VARCHAR(12) and contains strings like 'Home', 'Mobile', and 'Other'. Apply…
q15
What three situations make it necessary to make a substitute key instead of the main key of a relation?
Which of the following is true? BCNF and 3NF are same. A relation in BCNF is always in ONF A relation in BCNF is not in 3NE A relation in 3NF is always in BCNF.
In the figure below, STUDENT relation has a composite primary key contains Stud_ID and Course_ID. This relation is STUDENT Stud ID Name Course ID Units 101 Lennon MSI 250 3.00 101 Lennon MSI 415 3.00 125 Johnson MSI 331 3.00
Q7: An ERD about a company has been mapped to the following Relations. Please choose the correct statement that describes the company Employee(ID,E.Name, Salary) Project(Name, Location, ID) Project Location(Name, Location) a. A company has several projects and employees. An employee can work on one or more projects. A project can be located at several locations b. A company has several projects and employees. An employee can work on a single project only and each project has several employees. A project can be located at several locations c. A company has several projects and employees. An employee can work on one or more projects. A project is located at a single location d. A company has several projects and employees. An employee can work on one project only. A project can be located at several locations Employee EID 001 002 003 004 005 006 Name Ahmad Ali Sameh Salem Huda Ali Department group by Name order by EID; a. TWO columns and FOUR records b. TWO columns and ONE record c. TWO…
Given the database schema below, write a relational algebra expression to get the count of records in the DEPENDENT relation group by Essn. Also, show the result of your query.
How many of the relations in Johnny's logical database design have a composite primary key?