Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ana R2 S444 Charlotte R2 S555 Aidan R3 Có66 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the third record (R3, Cliff) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have 6 records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records

Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ana R2 S444 Charlotte R2 S555 Aidan R3 Có66 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the third record (R3, Cliff) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have 6 records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ang R2 S444 Charlotte R2 S555 Aidan R3 C666 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE RESTRICT option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the last record (R4, William) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records
Task 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 MAINTENACE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. 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. Create a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the three fields. The CAR_ID and MAINTENACNE_TYPE_ID should be foreign…
Observe the HOMETOWN REALESTATE database: SELLER SellerID SellerName RealtorID S111 Paul R1 S222 Carly R1 S333 Ana R2 S444 Charlotte R2 S555 Aidan R3 C666 Eric R1 C777 Christina R1 REALTOR RealtorID RealtorName R1 Claire R2 Kate R3 Cliff R4 William If a DBMS enforces a DELETE CASCADE option on the referential integrity constraint between SELLER and REALTOR in the HOMETOWN REALESTATE database, what will be the outcome after a user tries to delete the last record (R4, William) from REALTOR? O SELLER will have 7 records, REALTOR will have 4 records O SELLER will have 6 records, REALTOR will have 3 records O SELLER will have 7 records, REALTOR will have 3 records O SELLER will have 6 records, REALTOR will have 4 records O SELLER will have 3 records, REALTOR will have 3 records
Task 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 MAINTENACE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team.
To access a database, we need to open a connection to it first and close it once our job is done. Connecting to a database depends on the type of the target database and the database management system (DBMS). For example, connecting to a SQL Server database is different from connecting to an Oracle database. But both these connections have a few things in common: •They have a connection string •They can be opened•They can be closed•They may have a timeout attribute (so if the connection could not be opened within the timeout, an exception will be thrown).Your job is to represent these commonalities in a base class called DbConnection. This class should have two properties: ConnectionString : stringTimeout : TimeSpanA DbConnection will not be in a valid state if it doesn’t have a connection string. So you need to pass a connection string in the constructor of this class. Also, take into account the scenarios where null or an empty string is sent as the connection string. Make sure to…
A database has four transactions. Let min sup = 60% and min conf = 80%.cust ID TID items bought (in the form of brand-item category)01 T100 {King’s-Crab, Sunset-Milk, Dairyland-Cheese, Best-Bread}02 T200 {Best-Cheese, Dairyland-Milk, Goldenfarm-Apple, Tasty-Pie, Wonder-Bread}01 T300 {Westcoast-Apple, Dairyland-Milk, Wonder-Bread, Tasty-Pie}03 T400 {Wonder-Bread, Sunset-Milk, Dairyland-Cheese}(a) At the granularity of item category (e.g., itemi could be “Milk”), for the ruletemplate,∀X ∈ transaction, buys(X,item1) ∧ buys(X,item2) ⇒ buys(X,item3) [s,c],list the frequent k-itemset for the largest k, and all the strong association rules(with their support s and confidence c) containing the frequent k-itemset for thelargest k.(b) At the granularity of brand-item category (e.g., itemi could be “Sunset-Milk”),for the rule template,∀X ∈ customer, buys(X,item1) ∧ buys(X,item2) ⇒ buys(X,item3),list the frequent k-itemset for the largest k (but do not print any rules).
Task 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 MAINTENACE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. THIS IS FOR CENGAGE MYSQL
A database has four transactions. Let min_support=60% and min conf=80% TID date Items_bought T100 10/15/99 {K,A,D,B} T200 10/15/2000 {D,A,C,E,B} T300 10/19/2000 {C,A,B,E} T400 10/22/99 {B,A,D} Find all frequent itemset using Apriori and FP-growth respectively, Compare the efficiency of two mining processes List all strong association rules (with support s and confidence c).
Answer the following prompts 1The 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, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. 2The 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. Create a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the three fields. The CAR_ID and MAINTENANCE_TYPE_ID…
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?
A database has 4 transactions, shown below.TID Date items_boughtT100 10/15/04 {K, A, D, B}T200 10/15/04 {D, A, C, E, B}T300 10/19/04 {C, A, B, E}T400 10/22/04 {B, A, D}Assuming a minimum level of support min_sup = 60% and a minimum level ofconfidencemin_conf = 80%:(a) Find all frequent itemsets (not just the ones with the maximum width/length) using the Apriori algorithm. Show your work—just showing the final answer is not acceptable. For each iteration show the candidate and acceptable frequent itemsets. You should show your work similar to the way the example was done in thePowerPoint slides.(b)List all of the strong association rules, along with their support and confidence values, whichmatch the following metarule, where X is a variable representing customers and itemi denotes variables representing items (e.g., “A”, “B”, etc.).x  transaction, buys(X, item1)  buys(X, item2)  buys(X, item3)Hint: don’t worry about the fact that the statement above uses relations. The point of the…
The data item written by a committed transaction should be immediately stored on the disk. O True False The first step of the normalization process is to identify all foreign keys of a relation. True False The sorting operation can eliminate the duplicate tuples, but the hashing operation cannot. O True False