Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 2MC
Which of the following is not a valid constraint type?
- a. PRIMARY KEYS
- b. UNIQUE
- c. CHECK
- d. FOREIGN KEY
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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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- Which of the following commands can you use to rename a constraint? RENAME ALTER CONSTRAINT MOVE NEW NAME None of the above commands can be used.arrow_forwardWhich of the following types of constraints cant be created at the table level? a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table level.arrow_forwardWhich of the following SQL statements is invalid and returns an error message? ALTER TABLE books ADD CONSTRAINT books_pubid_uk UNIQUE (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_pk PRIMARY KEY (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_nn NOT NULL (pubid); ALTER TABLE books ADD CONSTRAINT books_pubid_fk FOREIGN KEY (pubid) REFERENCES publisher (pubid); All of the above statements are invalid.arrow_forward
- What is the difference between disabling a constraint and dropping a constraint?arrow_forwardWhich of the following is not a valid SQL statement? CREATE TABLE anothernewtable (newtableid VARCHAR2 (2)); CREATE TABLE anothernewtable (date, anotherdate) AS (SELECT orderdate, shipdate FROM orders); CREATE TABLE anothernewtable (firstdate, seconddate) AS (SELECT orderdate, shipdate FROM orders); All of the above are valid statements.arrow_forwardWhich of the following is a valid command?a. CREATE INDEX book_profit_idxON (retail-cost) WHERE (retail-cost) > 10;b. CREATE INDEX book_profit_idxON (retail-cost);c. CREATE FUNCTION INDEX book_profit_idxON books WHERE (retail-cost) > 10;d. both a and ce. none of the abovearrow_forward
- Which of the following types of constraints can’t be created at the table level? ( refer to the tables in the JustLee Books database). a. NOT NULL b. PRIMARY KEY c. CHECK d. FOREIGN KEY e. None of the above constraints can be created at the table levelarrow_forwardWhich of the following commands can you use to rename a constraint? ( refer to the tables in the JustLee Books database). a. RENAME b. ALTER CONSTRAINT c. MOVE d. NEW NAME e. None of the above commands can be used.arrow_forwardWhich of the following are the features of a primary key? a. Unique value b. Not null c. All d. Not repeatedarrow_forward
- Which of the following operators is considered a single-row operator? (refer to the tables in the JustLee Books database.)a. INb. ALLc. <>d. <>ALLarrow_forwardWhich of the following is not a valid SQL statement?a. CREATE TABLE anothernewtable (newtableid VARCHAR2(2));b. CREATE TABLE anothernewtable (date, anotherdate) AS (SELECT orderdate, shipdate FROM orders);c. CREATE TABLE anothernewtable (firstdate, seconddate) AS (SELECT orderdate, shipdate FROM orders);d. All of the above are valid statements.arrow_forwardWhich of the following is a valid SQL statement?a. ALTER TABLE secustomersspent ADD DATE lastorder;b. ALTER TABLE secustomerorders DROP retail;c. CREATE TABLE newtable AS (SELECT * FROM customers);d. ALTER TABLE drop column *;arrow_forward
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