Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 3, Problem 18P
Program Plan Intro
Primary Key:
A Primary Key in a
Example:
Students in Universities are assigned a unique registration number.
Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.
Foreign Key:
Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.
Example:
In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.
Entity Integrity:
Entity Integrity is a
- The primary key of one database table row must not match the primary key of any other row present in the table.
- No component of primary key must be null.
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Chapter 3 Solutions
Database Systems: Design, Implementation, & Management
Ch. 3 - What is the difference between a database and a...Ch. 3 - Prob. 2RQCh. 3 - Prob. 3RQCh. 3 - What are the requirements that two relations must...Ch. 3 - Which relational algebra operators can be applied...Ch. 3 - Explain why the data dictionary is sometimes...Ch. 3 - A database user manually notes that The file...Ch. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - Prob. 10RQ
Ch. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - Use Figure Q3.13 to answer Questions 1317. FIGURE...Ch. 3 - Create the table that results from applying a...Ch. 3 - Write the relational algebra formula to apply an...Ch. 3 - Create the table that results from applying an...Ch. 3 - Using the tables in Figure Q3.13, create the table...Ch. 3 - Prob. 18RQCh. 3 - Prob. 19RQCh. 3 - Prob. 20RQCh. 3 - Identify and describe the components of the table...Ch. 3 - Identify the primary keys. FIGURE Q3.22 THE...Ch. 3 - Identify the foreign keys. FIGURE Q3.22 THE...Ch. 3 - Create the ERM. FIGURE Q3.22 THE CH03_THEATER...Ch. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 26RQCh. 3 - What would be the conceptual view of the INDEX...Ch. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Describe the type(s) of relationship(s) between...Ch. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 13PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - For each table, identify the primary key and the...Ch. 3 - Prob. 18PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Identify the TRUCK tables candidate key(s). FIGURE...Ch. 3 - For each table, identify a superkey and a...Ch. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Create the ERD. (Hint: Look at the table contents....Ch. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Create the table that would result from applying...Ch. 3 - Create the table that would result from applying...Ch. 3 - Create the table that would result from applying a...
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- Do the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key. FIGURE P3.17 THE CH03_TRANSCO DATABASE TABLESarrow_forwardDo the tables exhibit referential integrity? Answer yes or no, and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key.arrow_forwardFor each table, identify the primary key and the foreign key(s). If a table does not have a foreign key, write None. FIGURE P3.17 THE CH03_TRANSCO DATABASE TABLESarrow_forward
- Create the table that results from applying an INTERSECT relational operator to the tables shown in Figure Q3.13. FIGURE Q3.13 THE CH03_VENDINGCO DATABASE TABLESarrow_forwardHow is the processing of SQL DDL statements (such as CREATE TABLE) different from the processing required by DML statements?arrow_forwardWhat is a primary key? What is the primary key for each of the tables in the Colonial Adventure Tours database shown in Chapter 1?arrow_forward
- How does Second Normal Form (2NF) differ from Third Normal Form (3NF), and why might you choose one over the other in database design?arrow_forwardExplain the concept of normalization in database design. What are the advantages of using normalized tables in a database?arrow_forwardSQL Database Designs Identify the functional dependencies in the following unnormalized table. Convert the table to third normal form. TRIP (TRIP_ID, TRIP_NAME, STATE_ABBREVIATION, STATE_NAME, (GUIDE_NUM, GUIDE_LAST, GUIDE_FIRST))arrow_forward
- A concise explanation of the many reasons why the use of tables in database design is a good idea could be of some use. Would you mind providing a brief remark on the subject of NULL?arrow_forwardHelp with SQL database 2. In database lab01, create 4 tables: course, advisor, student, and department (Note: The order of tables below is not proper for creating tables. Please think about which table should be created first) course (course_id varchar(8), title varchar(50), dept_name varchar(20), credits numeric(2,0), primary key (course_id), foreign key (dept_name) references department (dept_name)) advisor (s_ID varchar(5), i_ID varchar(5), primary key (s_ID), foreign key (s_ID) references student (ID)) student (ID varchar(5), name varchar(20) not null, dept_name varchar(20), tot_cred numeric(3,0), primary key (ID), foreign key (dept_name) references department (dept_name)) department (dept_name varchar(20), building varchar(15), budget numeric(12,2), primary key (dept_name)) . Populate tables (Note: The order of populating table below is not proper. Please think about which table should be populated first) Populate the table "student" with the data below: ('23121', 'Chavez',…arrow_forwardWhen considering creating a join between two tables, how are we demonstrating the concept of "relational" databases? Why is it essential that we create the join by finding a common attribute that is unique in at least one table and look at situations where that attribute has the same value ( is equal ) in both tables?arrow_forward
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