Tài liệu đáp án full quiz test môn đồ án cơ sở của fsoft

Question 1 of 20 What is data integrity? 5.0/ 5.0 Points A.It is the data contained in database that is shared. B.It is the data contained in database that is secured. C.It is the data contained in database that is non redundant. D.It is the data contained in database that is accurate and consistent. Question 2 of 20 A set of possible data values is called: 5.0/ 5.0 Points A.Attribute. B.Degree. C.Doma in. D.Tuple. 5.0/ 5.0 Points Question 3 of 20 The entity-relationship diagrams A and B shows the relationships between three entities in a school: teacher, class, and classroom. Which of the following is an appropriate interpretation concerning the diagrams? Here, " 1 1 " shows a one-to-one relationship while " 1 * " shows a one-to-many relationship. A.In A, one class is always assigned to the same classroom. In B, one class may be assigned to one or more classrooms. B.In A, one class is always supervised by one teacher. In B, one class may be supervised by one or more teachers. C.In A, when a teacher or a classroom is decided, a single class will be decided. In B, if a teacher and a classroom are decided, a single class will be decided. D.In A, a teacher is responsible for one class only. In B, a teacher may be responsible for one or more classes. Question 4 of 20 An advantage of the database management approach is: 5.0/ 5.0 Points A.Data is dependent on programs. B.Data redundancy increases. C.Data is integrated and can be accessed by multiple programs. D. None of the above. Question 5 of 20 It is better to use files than a DBMS when there are: 5.0/ 5.0 Points A.Stringent real-time requirements. B.Multiple users wish to access the data. C.Complex relationships among data. D. All of the above. Question 6 of 20 NULL is: 5.0/ 5.0 Points A.The same as 0 for integer B.The same as blank for character C.The same as 0 for integer and blank for character D.Not a value 0.0/ 5.0 Points Question 7 of 20 If both the functional dependencies : X→Y and Y→X hold for two attributes X and Y then the relationship between X and Y is A.1:1 B.1:M C.M:N D. M:1 Question 8 of 20 Which of the following is the appropriate characteristic of a database? 5.0/ 5.0 Points A.Because a database is created to suit the format of the data, it cannot respond flexibly to data format changes. B.It is difficult to share data between operations due to an exclusive control function. C.The procedure for making backups is complicated. D.It can be accessed by multiple users at the same time due to an exclusive control function. Question 9 of 20 In case of entity integrity, the primary key may be: 5.0/ 5.0 Points A.Not Null B.Both Null & not Null. C.Null Question 10 of 20 Which of the following are the properties of entities? 5.0/ 5.0 Points A.Groups B.Switchboards C.Attributes D.Table 0.0/ 5.0 Points Question 11 of 20 You are tasked with creating a database to manage where computers are installed at a company that has offices in several buildings. You create an “asset” table, a “room” table, and a “building” table, and link each of them together. When new data is entered, the data in the referenced table must already exist. Which of the following is the appropriate order of in-put? Here, the underlined items in each table are either primary or foreign keys. A.“Building” table →“Room” table →“Asset” table B.“Room” table →“Building” table →“Asset” table C.“Asset” table →“Building” table →“Room” table D.“Room” table →“Asset” table →“Building” table 0.0/ 5.0 Points Question 12 of 20 You are building a new database for a company with 10 departments. Each department contains multiple employees. In addition, each employee might work for several departments. How should you logically model the relationship between the department entity and the employee entity? User(User_ID, User_Name, Address) Reservation(User_ID, Book_Title_ID, Reservation_Date) Book_Title(Book_Title_ID, Category_Code, Book_Title, Author) Stocked_Book(Stocked_Book_ID, Book_Title_ID, Purchase_Date, Cumulative_Lending_Count) A.Create a new entry, create a one-to-many relationship from the new entry to the employee entry, and then create a one-to-many relationship from the entry to the department entry. B.Create a mandatory one-to-many relationship between department and employee. C.Create an optional one-to-many relationship between department and employee. D.Create a new entry, create a one-to-many relationship from the employee to the new entry, and create a one-to-many relationship from the department entry to the new entry. Question 13 of 20 The file organization that provides very fast access to any arbitrary record of a file is: 5.0/ 5.0 Points A.Ordered file. B. B-tree. C.Unordered file. D.Hashed file. Question 14 of 20 A relation is considered a: A.three-dimensional table. 5.0/ 5.0 Points B.two-dimensional table. C.Column. D. one-dimensional table. 5.0/ 5.0 Points Question 15 of 20 In the ERD diagram, the one-to-many relationship, "a company has multiple employees," is expressed as follows: Which of the following statements correctly explains the above diagram? A.There are multiple companies, and each company has a shareholder. B.There are multiple companies, and each company has multiple shareholders. C.One company has one shareholder. D.One company has multiple shareholders. 0.0/ 5.0 Points Question 16 of 20 If the condition given below applies, which of the following is appropriate as an E-R diagram showing the departments employees belong to? A. B. C. D. Question 17 of 20 The values of the attribute describes a particular_____________ 0.0/ 5.0 Points A.Entity set B.Entity instance C.Organization D.File Question 18 of 20 In the relational modes, cardinality is termed as: 5.0/ 5.0 Points A.Number of tables. B. Number of tuples. C.Number of attributes. D.Number of constraints. Question 19 of 20 What is a relationship called when it is maintained between two entities? 5.0/ 5.0 Points A.Ternary B.Binary C.Quaternary D.Unary 5.0/ 5.0 Points Question 20 of 20 Which of the following appropriately describes a domain (defined area), a term used for relational databases? A. It is a specification for copying the real world to a database. B.It is a relationship derived by applying the relational operations to the basic relationship. C.It is the general term for data insertion, updating, deletion, and search in a database. D.It is a set of values that attributes can hold. Question 1 of 20 The database environment has all of the following components except: 0.0/ 5.0 Points A.Users. B.Database. C.Separate files. D. Database administrator. Question 2 of 20 A relation is considered a: 5.0/ 5.0 Points A.three-dimensional table. B.two-dimensional table. C.Column. D. one-dimensional table. 0.0/ 5.0 Points Question 3 of 20 Which of the following appropriately describes a domain (defined area), a term used for relational databases? A.It is a relationship derived by applying the relational operations to the basic relationship. B. It is a specification for copying the real world to a database. C.It is a set of values that attributes can hold. D.It is the general term for data insertion, updating, deletion, and search in a database. Question 4 of 20 DBMS helps achieve: 5.0/ 5.0 Points A.Data independence. B.Centralized control of data. C.Neither (A) nor (B). D.Both (A) and (B). Question 5 of 20 An entity set that does not have sufficient attributes to form a primary key is a: A.Weak entity set. B.Primary entity set. C.Strong entity set. 5.0/ 5.0 Points D.Simple entity set. 0.0/ 5.0 Points Question 6 of 20 The method in which records are physically stored in a specified order according to a key field in each record A.Hash. B.Direct. C.Sequential. D.All of the above. Question 7 of 20 A set of possible data values is called: 5.0/ 5.0 Points A.Degree. B.Tuple. C.Domain. D.Attribute. 5.0/ 5.0 Points Question 8 of 20 Which of the following appropriately describes a schema in a relational database management system? A.It is the general term for database operations such as data insertion, updating, deletion, search, etc. B.It is the general term for various conditions and constraints that are used to maintain the database in absolutely perfect condition. C.It is a set of data definitions such as the data properties, format, relationship with other data, etc. D.It is not an actual table but a virtual table from the perspective of the user. 5.0/ 5.0 Points Question 9 of 20 The entity-relationship diagrams A and B shows the relationships between three entities in a school: teacher, class, and classroom. Which of the following is an appropriate interpretation concerning the diagrams? Here, " 1 1 " shows a one-to-one relationship while " 1 * " shows a one-to-many relationship. A.In A, when a teacher or a classroom is decided, a single class will be decided. In B, if a teacher and a classroom are decided, a single class will be decided. B.In A, one class is always assigned to the same classroom. In B, one class may be assigned to one or more classrooms. C.In A, one class is always supervised by one teacher. In B, one class may be supervised by one or more teachers. D.In A, a teacher is responsible for one class only. In B, a teacher may be responsible for one or more classes. Question 10 of 20 In an E-R diagram double lines indicate 0.0/ 5.0 Points A.Total participation. B.Multiple participation. C.Cardinality N. D.None of the above. Question 11 of 20 In a relation: 5.0/ 5.0 Points A.Ordering of rows is immaterial. B.No two rows are identical. C.(A) and (B) both are true. D.None of these. Question 12 of 20 Which of the following is not a restriction for a table to be a relation? A.The cells of the table must contain a single value. B.No two rows in a table may be identical. C.The columns must be ordered. D.All of the entries in any column must be of the 0.0/ 5.0 Points same kind. Question 13 of 20 The conceptual model is: 0.0/ 5.0 Points A.Dependent on software. B.Dependent on hardware. C. Independent of both hardware and software. D.Dependent on both hardware and software. Question 14 of 20 The values of the attribute describes a particular_____________ 0.0/ 5.0 Points A.Organization B.Entity set C.File D.Entity instance Question 15 of 20 The file organization that provides very fast access to any arbitrary record of a file is: 5.0/ 5.0 Points A. B-tree. B.Hashed file. C.Unordered file. D.Ordered file. Question 16 of 20 In case of entity integrity, the primary key may be: 5.0/ 5.0 Points A.Both Null & not Null. B.Not Null C.Null 5.0/ 5.0 Points Question 17 of 20 The DBMS acts as an interface between what two components of an enterprise-class database system? A. Database application and the database B.Database application and SQL C. Data and the database D.The user and the database application Question 18 of 20 5.0/ 5.0 Points The RDBMS terminology for a row is: A.Attribute. B.Relation. C.Tuple. D.Degree. Question 19 of 20 A relational database developer refers to a record as: 0.0/ 5.0 Points A.A criteria. B.A tuple. C.An attribute. D.A relation. Question 20 of 20 Which of the following is another name for weak entity? 0.0/ 5.0 Points A.Child B.Owner C.Dominant D.All of the above HAUI_010_NSD_Quiz1_DB Designer Return to Assessment List Part 1 of 1 Question 1 of 20 80.0/ 100.0 Points 0.0/ 5.0 Points Conceptual design A.Is a documentation technique. B.Is designing the relational model. C. Needs data volume and processing frequencies to determine the size of the database. D.Involves modelling independent of the DBMS. Question 2 of 20 0.0/ 5.0 Points In an E-R diagram attributes are represented by: A.Rectangle. B.Ellipse. C.Square. D.Triangle. Question 3 of 20 5.0/ 5.0 Points A set of possible data values is called: A.Tuple. B.Domain. C.Attribute. D.Degree. Question 4 of 20 5.0/ 5.0 Points The RDBMS terminology for a row is: A.Relation. B.Tuple. C.Degree. D.Attribute. Question 5 of 20 5.0/ 5.0 Points The DBMS acts as an interface between what two components of an enterprise-class database system? A.Database application and SQL B. Database application and the database C. Data and the database D.The user and the database application Question 6 of 20 0.0/ 5.0 Points You are building a new database for a company with 10 departments. Each department contains multiple employees. In addition, each employee might work for several departments. How should you logically model the relationship between the department entity and the employee entity? User(User_ID, User_Name, Address) Reservation(User_ID, Book_Title_ID, Reservation_Date) Book_Title(Book_Title_ID, Category_Code, Book_Title, Author) Stocked_Book(Stocked_Book_ID, Book_Title_ID, Purchase_Date, Cumulative_Lending_Count) A.Create a new entry, create a one-to-many relationship from the new entry to the employee entry, and then create a one-to-many relationship from the entry to the department entry. B.Create an optional one-to-many relationship between department and employee. C.Create a new entry, create a one-to-many relationship from the employee to the new entry, and create a one-to-many relationship from the department entry to the new entry. D.Create a mandatory one-to-many relationship between department and employee. Question 7 of 20 5.0/ 5.0 Points A DBMS query language is designed to: A.Support end users who use English-like commands. B.Support in the development of complex applications software. C.Specify the structure of a database. D. All of the above. Question 8 of 20 5.0/ 5.0 Points Consider the join of a relation R with relation S. If R has m tuples and S has n tuples, then the maximum size of join is: A.mn B.m+n C.2(m+n) D.(m+n)/2 Question 9 of 20 5.0/ 5.0 Points Which of the following appropriately describes a schema in a relational database management system? A.It is a set of data definitions such as the data properties, format, relationship with other data, etc. B.It is not an actual table but a virtual table from the perspective of the user. C.It is the general term for various conditions and constraints that are used to maintain the database in absolutely perfect condition. D.It is the general term for database operations such as data insertion, updating, deletion, search, etc. Question 10 of 20 5.0/ 5.0 Points The following data model has been created as a part of a library reservation system. Which is the correct description for it? In this question, 1 * means one-to-many cardinality and the underlined attributes in the table definition are primary keys User(User_ID, User_Name, Address) Reservation(User_ID, Book_Title_ID, Reservation_Date) Book_Title(Book_Title_ID, Category_Code, Book_Title, Author) Stocked_Book(Stocked_Book_ID, Book_Title_ID, Purchase_Date, Cumulative_Lending_Count) A.The Book_Title entity is an abstract entity that has no physical substance B.The Stocked_Book to be lent can be decided at the time of reservation C.The cardinality between the Book_Title entity and Stocked_Book entity is opposite D. It is redundant to separate the Book_Title entity and Stocked_Booked entity Question 11 of 20 5.0/ 5.0 Points In a relation: A.Ordering of rows is immaterial. B.No two rows are identical. C.(A) and (B) both are true. D.None of these. Question 12 of 20 Which of the following is expressed by an E-R diagram? A.Relation between entities 5.0/ 5.0 Points B.Relation between process and relationship C.Relation between processes D.Relation between entity and process Question 13 of 20 5.0/ 5.0 Points Which of the following is described graphically using an E-R diagram? A.Data source and destination B.Hierarchical data structure C.Data flows between processes D.Entities and relationships between entities Question 14 of 20 5.0/ 5.0 Points In the relational modes, cardinality is termed as: A. Number of tuples. B.Number of attributes. C.Number of constraints. D.Number of tables. Question 15 of 20 5.0/ 5.0 Points The values of the attribute describes a particular_____________ A.Organization B.Entity set C.Entity instance D.File Question 16 of 20 0.0/ 5.0 Points If the condition given below applies, which of the following is appropriate as an E-R diagram showing the departments employees belong to? A. B. C. D. Question 17 of 20 5.0/ 5.0 Points Which of the following is not a restriction for a table to be a relation? A.All of the entries in any column must be of the same kind. B.No two rows in a table may be identical. C.The columns must be ordered. D.The cells of the table must contain a single value. Question 18 of 20 5.0/ 5.0 Points An entity set that does not have sufficient attributes to form a primary key is a: A.Simple entity set. B.Primary entity set. C.Weak entity set. D.Strong entity set. Question 19 of 20 5.0/ 5.0 Points In the ERD diagram, the one-to-many relationship, "a company has multiple employees," is expressed as follows: Which of the following statements correctly explains the above diagram? A.One company has multiple shareholders. B.There are multiple companies, and each company has multiple shareholders. C.There are multiple companies, and each company has a shareholder. D.One company has one shareholder. Question 20 of 20 5.0/ 5.0 Points In E-R diagram generalization is represented by A.Dashed ellipse B.Ellipse C.Rectangle D.Triangle Question 1 of 20 5.0/ 5.0 Points A relational database developer refers to a record as: A.A criteria. B.An attribute. C.A relation. D.A tuple. Question 2 of 20 0.0/ 5.0 Points In an E-R diagram double lines indicate A.Total participation. B.Multiple participation. C.Cardinality N. D.None of the above. Question 3 of 20 5.0/ 5.0 Points NULL is: A.The same as 0 for integer B.The same as blank for character C.The same as 0 for integer and blank for character D.Not a value Question 4 of 20 0.0/ 5.0 Points If both the functional dependencies : X→Y and Y→X hold for two attributes X and Y then the relationship between X and Y is A.M:1 B.1:1 C.M:N D.1:M Question 5 of 20 5.0/ 5.0 Points The DBMS acts as an interface between what two components of an enterprise-class database system? A. Database application and the database B. Data and the database C.Database application and SQL D.The user and the database application Question 6 of 20 0.0/ 5.0 Points Which of the following is expressed by an E-R diagram? A.Relation between entities B.Relation between entity and process C.Relation between processes D.Relation between process and relationship Question 7 of 20 5.0/ 5.0 Points DBMS helps achieve: A.Data independence. B.Centralized control of data. C.Neither (A) nor (B). D.Both (A) and (B). Question 8 of 20 5.0/ 5.0 Points The database environment has all of the following components except: A.Separate files. B.Database. C.Users. D. Database administrator. Question 9 of 20 0.0/ 5.0 Points The following data model has been created as a part of a library reservation system. Which is the correct description for it? In this question, 1 * means one-to-many cardinality and the underlined attributes in the table definition are primary keys User(User_ID, User_Name, Address) Reservation(User_ID, Book_Title_ID, Reservation_Date) Book_Title(Book_Title_ID, Category_Code, Book_Title, Author) Stocked_Book(Stocked_Book_ID, Book_Title_ID, Purchase_Date, Cumulative_Lending_Count) A.The cardinality between the Book_Title entity and Stocked_Book entity is opposite B. It is redundant to separate the Book_Title entity and Stocked_Booked entity C.The Book_Title entity is an abstract entity that has no physical substance D.The Stocked_Book to be lent can be decided at the time of reservation Question 10 of 20 5.0/ 5.0 Points Which of the following are the properties of entities? A.Attributes B.Switchboards C.Table D.Groups Question 11 of 20 5.0/ 5.0 Points A relation is considered a: A.three-dimensional table. B.two-dimensional table. C. one-dimensional table. D.Column. Question 12 of 20 5.0/ 5.0 Points Conceptual design A.Is designing the relational model. B.Is a documentation technique. C. Needs data volume and processing frequencies to determine the size of the database. D.Involves modelling independent of the DBMS. Question 13 of 20 0.0/ 5.0 Points When the data model is represented to conform to the notational convention shown below, which of the following statements appropriately interprets the designated E-R diagram? A.It doe not occur that a single order placement is given for multiple types of products. B.A single product is supplied by a single supplier. C.It does not occur that a single order placement is given to multiple suppliers. D.Order statements and delivery statements have a one-to-one correspondence. Question 14 of 20 5.0/ 5.0 Points You are building a new database for a company with 10 departments. Each department contains multiple employees. In addition, each employee might work for several departments. How should you logically model the relationship between the department entity and the employee entity? User(User_ID, User_Name, Address) Reservation(User_ID, Book_Title_ID, Reservation_Date) Book_Title(Book_Title_ID, Category_Code, Book_Title, Author)