iv. SELECT * FROM OrderLine WHERE discount = 0.1; Create an index such that the execution of the SELECT statement must traverse the index vertically and then horizontally and it MUST access the relational table OrderLine. v. SELECT quantity, discount FROM OrderLine WHERE OrderNum = '0123' AND LineNum = 1 AND item = '27 inch monitor'; Create an index such that the execution of the SELECT statement must traverse the index vertically and MUST access the relational table OrderLine.

iv. SELECT * FROM OrderLine WHERE discount = 0.1; Create an index such that the execution of the SELECT statement must traverse the index vertically and then horizontally and it MUST access the relational table OrderLine. v. SELECT quantity, discount FROM OrderLine WHERE OrderNum = '0123' AND LineNum = 1 AND item = '27 inch monitor'; Create an index such that the execution of the SELECT statement must traverse the index vertically and MUST access the relational table OrderLine.

A Guide to SQL

9th Edition

ISBN:9781111527273

Author:Philip J. Pratt

Publisher:Philip J. Pratt

Chapter2: Database Design Fundamentals

Section: Chapter Questions

Problem 11RQ

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QUESTION 1 SQL: Consider the following database schema for flight reservation database. A flight can be booked by many passengers, and a passenger can book different flights. For each booking, the date of the flight and price are recorded. The database schema is given below Flight (FID:int, Airline:string(unique), DepartingAirport:string, ArrivalAirport:string, Rating: int (1,2,3,4,5) ) Booking (FlightID: int, PassengerCPR: int, Date: date, Time: time, Price: double) Passenger (CPR:int, FirstName: String, LastName: String, Address:String) Write SQL Code to: Create the Flight Table.List the Departing Airport and Arrival Airport for all flights with rating 4 or 5.
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TASK 1 1. The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, cook up a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. Task: Make a new table to store car maintenance types. Task 2: The Car Maintenance team also wants to store the actual maintenance operations in the database. The team wants to start with a table to store CAR_ID (CHAR(5)), MAINTENANCE_TYPE_ID (CHAR(5)) and MAINTENANCE_DUE (DATE) date for the operation. Make a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the…
Database Systems Each branch of the Jaja restaurant has a mainstay menu that is very popular with customers, so information on the availability of the number of servings is needed to be able to serve orders. Here are two transactions that are ordering a food menu at the same time. T1: Start the transaction at time t1, read 10 servings of food stock at t2. Because ordering one portion, the stock is reduced by 1 at t3. On t6, update the stock count, and commit to t7. T2: Transaction T2 starts a transaction on t2, reads the number of stocks in t3 as many as 10. At t4 orders 3 portions. On t5 it updates the stock to 7 and then on t6 commits it. As a result of the T1 and T2 transactions above, there was an error in the amount of food stocks. Make a solution with 2PL. What kinds of problems happened? Give a reason why choosing this type of problem! How much food is still available?
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1. PHP Programming for DB connection a. To connect to a database with a php program, given the hostname is “localhost”, username is “ericwei”, password is “bmccu”, db_name is “db350” what is the database connection statement in php if the returning value assigned to a variable $dbc? b. If the returning value of database connection statement is assigned to $dbc, what is the statement to execute a database selection statement “SELECT * FROM Customer;” for a returning variable of $r? c. If there are more than one records returned from the server, what is the PHP statement to loop through all the records and print out the column of first_name on the client side? (10 pts) d. Normally where you store the database connection php file? Why? (5 pts)
Create a database with numerous preset functions.
Imagine a database of students where the StudentID is the main key, and there are other indexes on Major, Age, MaritalStatus, and HomeZipCode (all secondary keys). Let's assume the institution wanted a list of MIS or computer science majors who were over 25 and married and were from the 45462 postcode code OR computer engineering majors who were single and were from the 45462 zip code. In any case, they wanted the list to come from the 45462 zip code. How can indexes be used to guarantee that individuals will only have access to the info that fulfills this prerequisite?
Course: Principles of Database please solve it within 30 minutes. please please, pleaseThank you Single Choice Questions 11. Given a relation R and a condition f for selecting from relation R, the correct relational algebraic expression is ( ). A、R X R B、 R ⋈ R C、sf(R) D、 ∏f(R) 12. If relations R and S have a common attribute set Y, when executing , tuples that do not have matching values on attribute Y will be discarded. To avoid discarding those tuples, which operation should be used? ( ) A. Aggregation. B. Grouping. C. Outer union. D. Outer join. 13. To address the "lost update" problem, a transaction must obtain ( ) before updating a data set. A. Shared lock (S-lock). B. Exclusive lock (X-lock). C. Shared lock (S-lock) and exclusive lock (X-lock). D. Shared lock (S-lock) or exclusive lock (X-lock). 14. If, during the system operation, data stored on external storage is…
State some Pros and Cons of this UML design: The GroceryListManager application is designed to facilitate the management of grocery lists for users. It aims to streamline the process of creating, modifying, and organizing shopping lists by providing a range of functionalities such as adding items from a hierarchical database, specifying quantities, manual entry with auto-suggestion, persistent check-off marks, and managing multiple lists. This software design will outline the classes, attributes, operations, and relationships required to realize these functionalities in a UML class diagram. Additionally, a design information document will be provided to explain how each requirement is addressed in the design.

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