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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What happens when a constraint is followed? Unique I Primary Key (ii), Default (iii), and Check (iv) Unique I Primary Key (ii), Default (iii), and Check (iv)
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Relation:
Relation is a two-dimensional table in which data is named. The
relations have the named columns and numbers which denote the
unnamed rows.
Although relation is defined as the two-dimensional table of
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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_forwardQ9) find the least expensive priceQ10) List the UNIQUE v_code of vendors that provide productsQ11) find the most expensive priceQ12) List the number of products by vendor with the average price, include only the rows withaverage price below 10.00Q13) List all vendor rows (including the ones that have no matching products) and all matchingproduct rowsarrow_forward
- Database sql 1-Write the syntax to create an object table called people using people_typearrow_forwardA 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_forwardA table can have a maximum of how many PRIMARY KEY constraints?arrow_forward
- 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?arrow_forwardWhat are referential constraint actions?arrow_forwardHow is adding a NOT NULL constraint to an existing table different from adding other types of constraints?arrow_forward
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