Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 4, Problem 7RQ
When must you define constraints at the table level rather than the column level?
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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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- What is the difference between a PRIMARY KEY constraint and a UNIQUE constraint?arrow_forwardWhat is the difference between disabling a constraint and dropping a constraint?arrow_forwardTable name: Products Column Role Data Type Length Constraint Name P ID Stores the ID of a product Number 8. Primary key P Name Stores the name of a product Varchar2 25 P_entryDate Stores the entry date of a product Stores the expiry date of a product Date Cannot be null P_Expiry P Expiry date should be greater than P entryDate Date P Price Stores the price of a product Number 3,2 Cannot be null a) Write in SQL a command that creates the table Products according to the above description (2 marks). b) Write in SQL a statement that adds to the table Products a new column named supplierID of type Number(5). This column should be defined as a foreign key that relates the table Products to the table Supplier (1.5 marks). c) Write in SQL a query that lists all the details of products arranged in descending order according to the entry date (1.5 marks).arrow_forward
- The Data type involves which four objectives?arrow_forwardDomain Constraints means violations in size only Select one: O True O False Key constraint means violation when the primary key value is repeated Select one: O True O Falsearrow_forwardDefine the following constraints: Primary Key Unique What is the difference between these two constraints?arrow_forward
- A unique identifier for a data row that consists of more than one field is commonly called a: primary plus key composite primary key foreign key none of the abovearrow_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_forward
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