Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 4MC
What is the maximum number of PRIMARY KEY constraints allowed for a table?
- a. 1
- b. 2
- c. 30
- d. 255
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What is the maximum number of PRIMARY KEY constraints allowed for a table? ( refer to the tables in the JustLee Books database).
a. 1 b. 2 c. 30 d. 255
What is the maximum number of columns you can define as a primary key when using the column-level approach to creating a table? ( refer to the tables in the JustLee Books database). a. 0
b. 1
c. 30
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The database has three tables for tracking horse-riding lessons:
Horse with columns:
ID - primary key
RegisteredName
Breed
Height
BirthDate
Student with columns:
ID - primary key
FirstName
LastName
Street
City
State
Zip
Phone
EmailAddress
LessonSchedule with columns:
HorseID - partial primary key, foreign key references Horse(ID)
StudentID - foreign key references Student(ID)
LessonDateTime - partial primary key
Write a SELECT statement to create a lesson schedule for Feb 1, 2020 with the lesson date/time, student's first and last names, and the horse's registered name. Order the results in ascending order by lesson date/time, then by the horse's registered name. Make sure unassigned lesson times (student ID is NULL) appear in the results.
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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- A table can have a maximum of how many PRIMARY KEY constraints?arrow_forwardWrite CREATE TABLE statements to implement the following design. Include foreign key constraints. Define the individualID, and GroupID as identity columns. Decide which columns should allow null values, if any. Define Dues column with a default of zero and check constraints to allow only positive values.arrow_forwardWhat are the benefits of using a table in a database? write a brief remark regarding the value NULL?arrow_forward
- How can we check if a table has minimum redundency?A) There is no way to checkB) See if a table has any primary values duplicated somewhere elseC) Use a normal form to checkD) See if a table has a lot of null valuesarrow_forwardquestion 5 use the following picture to answer the following question Assuming all other tables are created, write a statement to create Inventory table with a Composite Primary key (INVID, ITEMID) and two Foreign Keys (INVID and ITEMID).arrow_forwarda column is acting as a unique reference key for a table which kind of key is this? a) compound b) primary c) composite d) foreignarrow_forward
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