Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 4, Problem 8RQ
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Foreign key constraints
- Structured Query Language (SQL) constraints are used to specify rules for the data in a table.
- A foreign key is a link used to group two tables together.
- It is a field in one table that refers to the primary key in another table...
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To which table do you add a FOREIGN KEY constraint if you want to make certain every book ordered exists in the BOOKS table? ( refer to the tables in the JustLee Books database).
Which type of constraint can be used to make certain the category for a book is included when a new book is added to inventory? ( refer to the tables in the JustLee Books database).
True or False?
An action query is accomplished by putting AS and an alternative name after the table name in the FROM clause.
Chapter 4 Solutions
Oracle 12c: SQL
Ch. 4 - What is the difference between a PRIMARY KEY...Ch. 4 - How can you verify the constraints that exist for...Ch. 4 - A table can have a maximum of how many PRIMARY KEY...Ch. 4 - Which type of constraint can be used to make...Ch. 4 - Which type of constraint should you use to ensure...Ch. 4 - How is adding a NOT NULL constraint to an existing...Ch. 4 - When must you define constraints at the table...Ch. 4 - Prob. 8RQCh. 4 - What is the difference between disabling a...Ch. 4 - Prob. 10RQ
Ch. 4 - Prob. 1MCCh. 4 - Which of the following is not a valid constraint...Ch. 4 - Which of the following SQL statements is invalid...Ch. 4 - What is the maximum number of PRIMARY KEY...Ch. 4 - Prob. 5MCCh. 4 - How many NOT NULL constraints can be created at...Ch. 4 - The FOREIGN KEY constraint should be added to...Ch. 4 - What is the maximum number of columns you can...Ch. 4 - Which of the following commands can you use to...Ch. 4 - Prob. 10MCCh. 4 - In the initial creation of a table, if a UNIQUE...Ch. 4 - Which type of constraint should you use on a...Ch. 4 - Which of the following commands can be used to...Ch. 4 - Which of the following keywords allows the user to...Ch. 4 - Which of the following data dictionary objects...Ch. 4 - Which of the following types of constraints cant...Ch. 4 - Suppose you created a PRIMARY KEY constraint at...Ch. 4 - You’re creating a new table consisting of three...Ch. 4 - Which of the following types of restrictions can...Ch. 4 - Which of the following is the valid syntax for...Ch. 4 - Prob. 1HOACh. 4 - Prob. 2HOACh. 4 - Prob. 3HOACh. 4 - Add a column named Base_salary with a datatype of...Ch. 4 - Create a table named BOOK_STORES to include the...Ch. 4 - Add a constraint to make sure the Rep_ID value...Ch. 4 - Change the constraint created in Assignment #6 so...Ch. 4 - Create a table named REP_CONTRACTS containing the...Ch. 4 - Produce a list of information about all existing...Ch. 4 - Issue the commands to disable and then enable the...
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- Change the constraint created in Assignment #6 so that associated rows of the BOOK_STORES table are deleted automatically if a row in the STORE_REPS table is deleted.arrow_forwardQUESTION 3 also known as RESTRICT, yields values for all rows found in a table that satisfy a given condition. SELECT UNION INTERSECT DIFFERENCEarrow_forwardThe OR_CASE table has one bro per surgical case. The OR_LOG table has one row per surgical log. It's LOG_ID column identifies each log. If a case has an associated log, OR_CASE.LOG_ID will store the logs ID. Otherwise, it will be null. A query uses the following join: FROM OR_CASE INNER JOIN OR_LOG ON OR_CASE.LOG_ID=OR_LOG.LOG_ID which of the following would be the results? A. A log with no associated case.B. A log with an associated case. C. A case with no associated log.D. Rows with no case or log.arrow_forward
- Write an appropriate SQL query to determine if there are any students that are not registered for any modules.Sample results:STUDENT_ID STUDENTS654321 Joe, ThaboRequirementsCorrect SELECT statement used. Correct JOIN used. Correct WHERE clause. Question 7 Write an appropriate SQL query to delete the following record from the STUDENTS table: STUDENT_ID: S654321STUDENT_SURNAME: JoeSTUDENT_NAME: ThaboRequirementsCorrect DELETE statement used. Correct WHERE clause.arrow_forwardreate a query that SELECT all of the EMPLOYEES from the EMPLOYEE TABLE that are Mangers. Include Employee ID first name, Lastname and Salary (Hint: Self Join) /* Write a query the gives the Employee ID first name, Lastname and Salary and Project Number of EMPLOYEES who aren't currently assigned to a project (hint outer join) Create a query that lists the lastnme, edlevel , job, the number of years they've worked as of Jan 01/2002 ( hint : year function Jan 01/2002 minus hiredate), and their salary. Get the employees that have the same Job as the employee named starts with J (hint subquery from employee) and hiredate < Jan 01/2002 Sort the listing by highest salary first. */arrow_forwardWhen we retrieve data from 2 tables, why do we need to specify a join condition to join the tables in the Where clause?arrow_forward
- A table can have a maximum of how many PRIMARY KEY constraints? ( refer to the tables in the JustLee Books database).arrow_forwardWhich type of constraint can be used to make certain the category for a book is included when a new book is added to inventory?arrow_forwardWhat is the maximum number of PRIMARY KEY constraints allowed for a table? a. 1 b. 2 c. 30 d. 255arrow_forward
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