Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 3MC
Which of the following SQL statements is invalid and returns an error message?
- a. ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid);
- b. ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid);
- c. ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid);
- d. ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid);
- e. All of the above statements are invalid.
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Draw the ERD
rI : ithat is implemented by the following SQL code:
CREATE TABLE PROJ_USER
USER_ID NUMBER NOT NULL,
USER_NAME VARCHAR2(50) NOT NULL,
USER_EMAIL VARCHAR2(50) NOT NULL,
CONSTRAINT USER_PK
PRIMARY KEY (USER_ID)
);
CREATE TABLE PROJ_CERTIFIEDUSER
USER_ID NUMBER NOT NULL,
CUSER_REALNAME VARCHAR2(50) NOT NULL,
CUSER_CERTIFICATION VARCHAR2(50) NOT NULL,
CONSTRAINT CERTIFIEDUSER_PK
PRIMARY KEY (USER_ID),
CONSTRAINT CERTIFIEDUSER_FK
FOREIGN KEY (USER_ID)
REFERENCES PROJ_USER (USER_ID)
);
Draw the ERD
that is implemented by the following SQL code:
CREATE TABLE PROJ_USER
USER_ID NUMBER NOT NULL,
USER_NAME VARCHAR2(50) NOT NULL,
USER_EMAIL VARCHAR2(50) NOT NULL,
CONSTRAINT USER_PK
PRIMARY KEY (USER_ID)
);
CREATE TABLE PROJ_CERTIFIEDUSER
USER_ID NUMBER NOT NULL,
CUSER_REALNAME VARCHAR2(50) NOT NULL,
CUSER_CERTIFICATION VARCHAR2(50) NOT NULL,
CONSTRAINT CERTIFIEDUSER_PK
PRIMARY KEY (USER_ID),
CONSTRAINT CERTIFIEDUSER_FK
FOREIGN KEY (USER_ID)
REFERENCES PROJ_USER (USER_ID)
);
THIS MODULE IS ABOUT SUBQUERIES, SO YOU MUST USE SUBQUERIES INSTEAD OF TABLE JOINS
(a) From which two fields in which table can you calculate the enrollment of a section?(b) From which table can you get both course and section numbers?(c) Which field in table SECTION uniquely identifies a section, section id or section no?(d) Write a SQL statement to show sections and their enrollment.(e) Write a SQL statement to show sections with enrollment greater than five. Display both course andsection numbers
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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