List and describe the three operations of a relational DBMS.
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- SQL databases conform to ACID properties. Briefly describe the ACID properties, and state the purpose of each. How does conformance to ACID properties affect the performance of SQL databases?Explain the concept of ACID properties in DBMS in your own wordsThe following tables form part of a database held in a relational DBMS: Hotel (hotelNo, hotelName, city) Room (roomNo, hotelNo, type, price) Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) Guest (guestNo, guestName, guestAddress) where Hotel contains hotel details and hotelNo is the primary key; Room contains room details for each hotel and (roomNo, hotelNo) forms the primary key; Booking contains details of bookings and (hotelNo, guestNo, dateFrom) forms the primary key Guest contains guest details and guestNo is the primary key. Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations.
- describe the subsequent sections are the foundation for the physical data structures used by most relational DBMSsDescribe the concept of transparency in a Distributed DBMS. What are the different types of transparency, and why is it important in a distributed database environment?The following tables form part of a database held in a relational DBMS: Hotel (hotelNo, hotelName, city) Room (roomNo, hotelNo, type, price) Booking. (hotelNo, guestNo, dateFrom, dateTo, roomNo) Guest (guestNo, guestName, guestAddress) where Hotel contains hotel details and hotelNo is the primary key; Room contains room details for each hotel and (roomNo, hotelNo) forms the primary key; Booking contains details of the bookings and (hotelNo, guestNo, dateFrom) forms the primary key; and Guest contains guest details and guestNo is the primary key. Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations. 2. Discuss the main characteristics of the database approach and how it differs from traditional file systems?
- The following tables form part of a database held in a relational DBMS: Hotel (hotelNo, hotelName, city) Room (roomNo, hotelNo, type, price) Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) Guest (guestNo, guestName, guestAddress) where: Hotel contains hotel details and hotelNo is the primary key; Room contains room details for each hotel and (roomNo, hotelNo) forms the primary key; Booking contains details of the bookings and (hotelNo, guestNo, dateFrom) forms the primary key; Guest contains guest details and guestNo is the primary key. Produce some sample tables for these relations that observe the relational integrity rules. Suggest some general constraints that would be appropriate for this schema.The following tables form part of a database held in a relational DBMS: • Hotel (hotelNo, hotelName, city) • Room (roomNo, hotelNo, type, price) • Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) • Guest (guestNo, guestName, guestAddress) where Hotel contains hotel details and hotelNo is the primary key; Room contains room details for each hotel and (roomNo, hotelNo) forms the primary key; Booking contains details of bookings and (hotelNo, guestNo, dateFrom) forms the primary key; Guest contains guest details and guestNo is the primary key. 1. Identify the foreign keys in this schema. Explain how the entity and referential integrity rules apply to these relations. 2. Produce some sample tables for these relations that observe the relational integrity rules. Suggest some general constraints that would be appropriate for this schema. 3. Analyze the RDBMSS that you are currently using. Determine the support the system provides for primary keys, alternate keys, foreign keys, relational…The following tables form part of a database held in a relational DBMS:Hotel (hotelNo, hotelName, city)Room (roomNo, hotelNo, type, price)Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo)Guest (guestNo, guestName, guestAddress)• Hotel contains hotel details and hotelNo is the primary key;• Room contains room details for each hotel and (roomNo, hotelNo) forms the primarykey;• Booking contains details of the bookings and (hotelNo, guestNo, dateFrom) forms theprimary key;• Guest contains guest details and guestNo is the primary key.Run the SQL statements for the following queries and report the screenshotsof these SQL statements and the results generated from PostgreSQL.(a) List the roomNo, type, and price of the Biltmore Hotel (using subquery) (or a specifichotel name in your database).(b) What is the average price of a room?(c) List the guestNo and gusetName of guests who live in Chicago or Seattle, alphabeticallyordered by their names.(d) List the number of rooms in each hotel in…
- What are the different levels of abstraction in the DBMS?The following tables form part of a database held in a relational DBMS:Hotel (hotelNo, hotelName, city)Room (roomNo, hotelNo, type, price)Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo)Guest (guestNo, guestName, guestAddress)• Hotel contains hotel details and hotelNo is the primary key;• Room contains room details for each hotel and (roomNo, hotelNo) forms the primarykey;• Booking contains details of the bookings and (hotelNo, guestNo, dateFrom) forms theprimary key;• Guest contains guest details and guestNo is the primary key.Download and install PostgreSQL (Version 14.5). Create the tables for the four rela-tions using the integrity enhancement features of SQL (using the “CREATE TABLE” state-ments) and populate at least 5 tuples for each relation (using the “INSERT” statements)in PostgreSQL. Please report the screenshots of these SQL statements generated fromPostgreSQL.Run the SQL statements for the following queries and report the screenshotsof these SQL statements and the…The following tables form part of a database held in a relational DBMS:-Hotel (hotelNo, hotelName, city)Room (roomNo, hotelNo, type, price)Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo)Guest (guestNo, guestName, guestAddress)where Hotel contains hotel details and hotelNo is the primary key;Room contains room details for each hotel and (roomNo, hotelNo) formsthe primary key;Booking contains details of the bookings and (hotelNo, guestNo,dateFrom) forms the primary key; and Guest contains guest details and guestNo is the primary key. b.Explain how the entity and referential integrity rules apply to these relations.c. Briefly discuss the main reasons for introducing the concepts of superclasses and subclasses into an ER model?