What happens when a user retrieves data from a view?
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What happens when a user retrieves data from a view?
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- Which of the following data dictionary objects should be used to view information about the constraints in a database? USER_TABLES USER_RULES USER_COLUMNS USER_CONSTRAINTS None of the above objects should be used.Change the CONTACT view so that no users can accidentally perform DML operations on the view.Create a view that lists the ISBN and title for each book in inventory along with the name and phone number of the person to contact if the book needs to be reordered. Name the view REORDERINFO.
- Create a view named CONDO_FEES. It consists of two columns: the first is the square footage, and the second is the average fee for all condos in the CONDO_UNIT table thathave that square footage. Use AVERAGE_FEE as the column name for the average fee.Group and order the rows by square footage. a. Write and execute the CREATE VIEW command to create the CONDO_FEES view. b. Write and execute the command to retrieve the square footage and average fee foreach square footage for which the average fee is greater than 500. c. Write and execute the query that the DBMS actually executes. d. Does updating the database through this view create any problems? If so, what arethey? If not, why not?Create a view named CONDO_OWNERS. It consists of the location number, unit number, square footage, bedrooms, baths, condo fee, and owners last name for every condo inwhich the number of bedrooms is three. a. Write and execute the CREATE VIEW command to create the CONDO_OWNERSview. b. Write and execute the command to retrieve the location number, unit number,condo fee, square footage, and owners last name for every condo in theCONDO_OWNERS view with a condo fee of less than 500. c. Write and execute the query that the DBMS actually executes. d. Does updating the database through this view create any problems? If so, what arethey? If not, why not?Delete the index named ITEM_INDEX3.