Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 7, Problem 3RQ
Program Plan Intro
Integrity constraints:
The limitations in the relational data model which is used to maintain the data’s accuracy and maintain its integrity is termed as integrity constraints.
In SQL CREATE TABLE commands, the types of integrity constraints enforced when a primary key is declared are:
- Entity integrity
- Referential integrity
Primary key:
Primary key is used to identify the unique record from a collection of records.
- To identify each record in a table, at least there must be one data field which should be unique. That is, corresponding data field of every record should be unique. It is called a primary key.
- To relate two tables, a primary key field in one table is added to the related table, and it is called foreign key.
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Chapter 7 Solutions
Database Systems: Design, Implementation, & Management
Ch. 7 - Prob. 1RQCh. 7 - Explain why the following command would create an...Ch. 7 - Prob. 3RQCh. 7 - Explain why it might be more appropriate to...Ch. 7 - What is the difference between a column constraint...Ch. 7 - What are referential constraint actions?Ch. 7 - Rewrite the following WHERE clause without the use...Ch. 7 - Explain the difference between an ORDER BY clause...Ch. 7 - Explain why the following two commands produce...Ch. 7 - What is the difference between the COUNT aggregate...
Ch. 7 - Prob. 11RQCh. 7 - Prob. 12RQCh. 7 - Write the SQL code that will create the table...Ch. 7 - Having created the table structure in Problem 1,...Ch. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Write the SQL code to change the job code to 501...Ch. 7 - Write the SQL code to delete the row for William...Ch. 7 - Write the SQL code that will restore the data to...Ch. 7 - Write the SQL code to create a copy of EMP_1,...Ch. 7 - Write the SQL code to change the EMP_PCT value to...Ch. 7 - Using a single command sequence, write the SQL...Ch. 7 - Prob. 11PCh. 7 - Write the SQL code that will change the PROJ_NUM...Ch. 7 - Write the two SQL command sequences required to:...Ch. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - Using the EMPLOYEE, JOB, and PROJECT tables in the...Ch. 7 - Write the SQL code that will produce the same...Ch. 7 - Write the SQL code to find the average bonus...Ch. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Write the SQL code to calculate the ASSIGN_CHARGE...Ch. 7 - Using the data in the ASSIGNMENT table, write the...Ch. 7 - Prob. 23PCh. 7 - Write the SQL code to generate the total hours...Ch. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - Generate a listing of all purchases made by the...Ch. 7 - Using the output shown in Figure P7.29 as your...Ch. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Use a query to compute the average purchase amount...Ch. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Using the results of the query created in Problem...Ch. 7 - Create a query to find the balance characteristics...Ch. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Write a query to display the SKU (stock keeping...Ch. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - Prob. 55PCh. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67PCh. 7 - Prob. 68PCh. 7 - Prob. 69PCh. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - Prob. 73PCh. 7 - Prob. 74PCh. 7 - Prob. 75PCh. 7 - Prob. 76PCh. 7 - Prob. 77PCh. 7 - Prob. 78PCh. 7 - Prob. 79PCh. 7 - Prob. 80PCh. 7 - Prob. 81PCh. 7 - Prob. 82PCh. 7 - Prob. 83PCh. 7 - Prob. 84PCh. 7 - Prob. 85PCh. 7 - Prob. 86PCh. 7 - Prob. 87PCh. 7 - Prob. 88PCh. 7 - Prob. 89PCh. 7 - Prob. 90PCh. 7 - Prob. 91PCh. 7 - Prob. 92PCh. 7 - Prob. 93PCh. 7 - Prob. 94PCh. 7 - Prob. 95PCh. 7 - Write the SQL code to create the table structures...Ch. 7 - The following tables provide a very small portion...Ch. 7 - Write the SQL command to save the rows inserted in...Ch. 7 - Write the SQL command to change the movie year for...Ch. 7 - Prob. 100CCh. 7 - Prob. 101CCh. 7 - Prob. 102CCh. 7 - Prob. 103CCh. 7 - Prob. 104CCh. 7 - Prob. 105CCh. 7 - Prob. 106CCh. 7 - Prob. 107CCh. 7 - Prob. 108CCh. 7 - Prob. 109CCh. 7 - Prob. 110CCh. 7 - Prob. 111CCh. 7 - Prob. 112CCh. 7 - Prob. 113CCh. 7 - Prob. 114CCh. 7 - Prob. 115CCh. 7 - Prob. 116CCh. 7 - Prob. 117CCh. 7 - Prob. 118CCh. 7 - Prob. 119CCh. 7 - Prob. 120CCh. 7 - Prob. 121CCh. 7 - Prob. 122CCh. 7 - Prob. 123CCh. 7 - Prob. 124CCh. 7 - Write a query to display the movie number, movie...
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- In what ways do these two integrity restrictions vary from one another?arrow_forwardUnder what circumstances would it be reasonable to assume that two select statements from the same database are consistent with one another?arrow_forwardWhen it comes to integrity restrictions, how do the two kinds differ?arrow_forward
- Explain the difference between integrity constraints and permission limitations.arrow_forwardWhat distinguishes authorization limits from integrity constraints?arrow_forwardWhen it comes to union, just where does it make the most sense to make the argument that two select statements drawn from the same database are consistent with one another?arrow_forward
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