MySQL Enterprise and Administrative Account Quiz
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Questions and Answers

Which one of the following is a key component of a database system that translates query processor instructions into low-level file-system commands that modify or retrieve data?

  • Transaction manager
  • Indexes
  • Query processor
  • Storage manager (correct)

    • Which one of the following is a file containing a complete record of all inserts, updates, and deletes processed by the database?

  • Catalog
  • Query processor
  • Log (correct)
  • Transaction manager

    • Which one of the following is a directory of tables, columns, indexes, and other database objects?

  • Catalog / data dictionary (correct)
  • Transaction manager
  • Query processor
  • Log

    • Which one of the following is a common query language used for writing database queries?

    <p>SQL (B)</p> Signup and view all the answers

    Which one of the following is an SQL statement that inserts rows into a table?

    <p>INSERT (B)</p> Signup and view all the answers

    Which one of the following is a specification of database objects such as tables, columns, data types, and indexes?

    <p>Database design (C)</p> Signup and view all the answers

    Which type of data is mostly digital in today's world?

    <p>Numeric (A)</p> Signup and view all the answers

    What is a database system?

    <p>Software that reads and writes data in a database (A)</p> Signup and view all the answers

    What is the role of a database administrator?

    <p>Securing the database system against unauthorized users (D)</p> Signup and view all the answers

    What is the purpose of a query language?

    <p>To read and write data in a database (C)</p> Signup and view all the answers

    What is the role of a database designer?

    <p>Determining the format of each data element and the overall database structure (D)</p> Signup and view all the answers

    What is the role of a database programmer?

    <p>Developing computer programs that utilize a database (A)</p> Signup and view all the answers

    Which of the following is a key feature of MySQL Enterprise?

    <p>MySQL Enterprise includes additional administrative applications. (A)</p> Signup and view all the answers

    What is the purpose of the root account in MySQL?

    <p>The root account has full control of MySQL. (B)</p> Signup and view all the answers

    What is the MySQL Command-Line Client used for?

    <p>The MySQL Command-Line Client is used for executing SQL commands using an editor. (A)</p> Signup and view all the answers

    What does MySQL Server return when an SQL statement is syntactically incorrect or the database cannot execute the statement?

    <p>MySQL Server returns an error code and description. (D)</p> Signup and view all the answers

    What is the purpose of MySQL Workbench?

    <p>MySQL Workbench is used for executing SQL commands using an editor. (D)</p> Signup and view all the answers

    Which of the following is a key feature of the relational model?

    <p>The relational model is a database model based on a tabular data structure. (D)</p> Signup and view all the answers

    Which statement is true about primary keys?

    <p>A primary key is a column used to identify a row. (C)</p> Signup and view all the answers

    What is the purpose of the TRUNCATE statement?

    <p>To delete all rows from a table. (C)</p> Signup and view all the answers

    What is a foreign key?

    <p>A column that refers to a primary key. (C)</p> Signup and view all the answers

    Which action is specified by the ON UPDATE clause of a FOREIGN KEY constraint?

    <p>Propagates primary key changes to foreign keys. (D)</p> Signup and view all the answers

    What does the UNIQUE constraint ensure?

    <p>Values in a column, or group of columns, are unique. (B)</p> Signup and view all the answers

    What is a constraint in a database?

    <p>A rule that governs allowable values in a database. (A)</p> Signup and view all the answers

    Which statement is true about the CREATE TABLE statement?

    <p>The CREATE TABLE statement creates a new table by specifying the table name, column names, and column data types. (B)</p> Signup and view all the answers

    What is the purpose of the DROP TABLE statement?

    <p>To delete a table, along with all the table's rows, from a database. (D)</p> Signup and view all the answers

    What are the data types represented by Decimal?

    <p>Numbers with fractional values (A)</p> Signup and view all the answers

    What does the IS NULL operator do?

    <p>Returns TRUE when the value is NULL (C)</p> Signup and view all the answers

    What does the LIMIT clause do in MySQL?

    <p>Limits the number of rows returned by a SELECT statement (A)</p> Signup and view all the answers

    What does the SET clause do in an UPDATE statement?

    <p>Specifies the new column values for an UPDATE statement (B)</p> Signup and view all the answers

    Which one of the following is a key feature of MySQL Community?

    <p>It is a free edition of MySQL (C)</p> Signup and view all the answers

    Which one of the following is a key component of a database system that interprets queries, creates a plan to modify the database or retrieve data, and returns query results to the application?

    <p>Query processor (B)</p> Signup and view all the answers

    What is the purpose of the UNIQUE constraint in a database?

    <p>It ensures that the column can only have unique values (C)</p> Signup and view all the answers

    Which one of the following is a common query language used for writing database queries?

    <p>SQL (B)</p> Signup and view all the answers

    What is the role of a database designer in the database design process?

    <p>To develop the specification of database objects such as tables, columns, data types, and indexes (B)</p> Signup and view all the answers

    Which SQL statement inserts rows into a table?

    <p>INSERT (C)</p> Signup and view all the answers

    Which of the following is responsible for securing the database system against unauthorized users?

    <p>Database administrator (B)</p> Signup and view all the answers

    What is the primary role of a database designer?

    <p>Determine the format of each data element and the overall database structure (C)</p> Signup and view all the answers

    Which type of data was mostly analog in the past?

    <p>Numeric (C)</p> Signup and view all the answers

    What is the purpose of a query language?

    <p>Write and execute queries in a database (B)</p> Signup and view all the answers

    What is the role of a database programmer?

    <p>Develop computer programs that utilize a database (C)</p> Signup and view all the answers

    What is the most common format for data encoding in today's world?

    <p>Zeros and ones (C)</p> Signup and view all the answers

    Which clause is used to specify a condition for selecting rows in a SELECT statement?

    <p>WHERE (B)</p> Signup and view all the answers

    What is the purpose of the IS NULL operator in SQL?

    <p>It returns TRUE when the value is NULL (B)</p> Signup and view all the answers

    Which statement is true about the NOT NULL constraint in SQL?

    <p>It prevents a column from having a NULL value (D)</p> Signup and view all the answers

    Which clause is used to add rows to a table in SQL?

    <p>INSERT INTO (A)</p> Signup and view all the answers

    What is the purpose of the SET clause in an UPDATE statement?

    <p>It specifies the new column values (C)</p> Signup and view all the answers

    What is a NULL value in SQL?

    <p>A special value that represents unknown or inapplicable data (D)</p> Signup and view all the answers

    Which statement is true about the MySQL Command-Line Client?

    <p>It allows developers to connect to the database server and execute SQL statements. (C)</p> Signup and view all the answers

    What is the purpose of the SHOW CREATE TABLE statement?

    <p>To show the CREATE TABLE statement for a table in the default database. (C)</p> Signup and view all the answers

    What is the purpose of the USE DatabaseName statement?

    <p>To select a default database for use in subsequent SQL statements. (C)</p> Signup and view all the answers

    What is the purpose of the DROP DATABASE DatabaseName statement?

    <p>To delete a database, including all tables in the database. (C)</p> Signup and view all the answers

    What is the purpose of the SHOW TABLES statement?

    <p>To list all tables in the default database. (C)</p> Signup and view all the answers

    What is the purpose of the SHOW COLUMNS FROM TableName statement?

    <p>To show the structure of a table in the default database. (D)</p> Signup and view all the answers

    Which statement is true about referential integrity?

    <p>Referential integrity requires foreign key values to be either NULL or match some value of the referenced primary key. (B)</p> Signup and view all the answers

    What is the purpose of the CASCADE action in a FOREIGN KEY constraint?

    <p>CASCADE propagates primary key changes to foreign keys. (D)</p> Signup and view all the answers

    What is a primary key?

    <p>A primary key is a column that ensures uniqueness and non-null values. (C)</p> Signup and view all the answers

    What does the TRUNCATE statement do?

    <p>The TRUNCATE statement deletes all rows from a table. (A)</p> Signup and view all the answers

    What is a foreign key?

    <p>A foreign key is a column that refers to a primary key. (D)</p> Signup and view all the answers

    What is the purpose of the UNIQUE constraint?

    <p>The UNIQUE constraint ensures that values in a column are unique. (B)</p> Signup and view all the answers

    Which operation combines two tables into one result, including all columns and all combinations of rows from both tables?

    <p>Product operation (C)</p> Signup and view all the answers

    Which operation selects table columns?

    <p>Project operation (A)</p> Signup and view all the answers

    Which operation selects table rows based on a logical expression?

    <p>Select operation (C)</p> Signup and view all the answers

    Which operation is equivalent to a product followed by a select?

    <p>Join operation (D)</p> Signup and view all the answers

    Which operation combines all rows of two compatible tables into a single table, excluding duplicate rows?

    <p>Union operation (D)</p> Signup and view all the answers

    Which one of the following is a database operation that reads table blocks directly, without accessing an index?

    <p>Table scan (B)</p> Signup and view all the answers

    Which one of the following is a single-level index that contains column values along with pointers to rows containing the column value?

    <p>Single-level index (D)</p> Signup and view all the answers

    Which one of the following is a multi-level index that stores column values and row pointers in a hierarchy?

    <p>Multi-level index (A)</p> Signup and view all the answers

    Which one of the following is a balanced multi-level index where all branches are the same length?

    <p>Balanced multi-level index (B)</p> Signup and view all the answers

    Which one of the following is a hash index where index entries are assigned to buckets?

    <p>Hash index (A)</p> Signup and view all the answers

    Which keyword represents the highest column value in a partition?

    <p>MAXVALUE (C)</p> Signup and view all the answers

    What type of partition requires a partition expression with positive integer values?

    <p>Hash partition (C)</p> Signup and view all the answers

    What is the partition number for each row computed as in a hash partition?

    <p>(partition expression value) modulo N (A)</p> Signup and view all the answers

    What does the physical design of a database specify?

    <p>Indexes, table structures, and partitions (C)</p> Signup and view all the answers

    What is the role of a storage engine or storage manager in a database system?

    <p>Translate instructions into low-level commands (D)</p> Signup and view all the answers

    Which operator is used in a WHERE clause to determine if a value matches one of several values?

    <p>IN (B)</p> Signup and view all the answers

    Which operator provides an alternative way to determine if a value is between two other values?

    <p>BETWEEN (C)</p> Signup and view all the answers

    What is a self-join?

    <p>A join between a table and itself. (D)</p> Signup and view all the answers

    What is a cross-join?

    <p>A join that combines two tables without comparing columns. (A)</p> Signup and view all the answers

    What is a subquery, sometimes called a nested query or inner query?

    <p>A query within another SQL query. (A)</p> Signup and view all the answers

    Which normal form is achieved when every cell of a table contains exactly one value and the table has a primary key?

    <p>First normal form (A)</p> Signup and view all the answers

    Which normal form is achieved when all non-key columns depend on the whole primary key?

    <p>Second normal form (C)</p> Signup and view all the answers

    Which normal form is achieved when all non-key columns depend on the key, the whole key, and nothing but the key?

    <p>Third normal form (C)</p> Signup and view all the answers

    Which normal form is achieved when, whenever a non-key column A depends on column B, then B is unique?

    <p>Boyce-Codd normal form (B)</p> Signup and view all the answers

    Which storage media is used to store large amounts of data and groups data in sectors?

    <p>Magnetic disk (B)</p> Signup and view all the answers

    Which of the following is true about cardinality in entity-relationship modeling?

    <p>Cardinality refers to the maximum and minimum number of relationships and attributes. (B)</p> Signup and view all the answers

    What is the cardinality of a relationship when the maximum number of instances of one entity that can relate to a single instance of another entity is one?

    <p>Singular (A)</p> Signup and view all the answers

    What is the cardinality of a relationship when the minimum number of instances of one entity that can relate to a single instance of another entity is zero?

    <p>Optional (C)</p> Signup and view all the answers

    What is the identifying attribute of a weak entity?

    <p>A weak entity does not have an identifying attribute. (A)</p> Signup and view all the answers

    What is a supertype entity in entity-relationship modeling?

    <p>A supertype entity is a subset of another entity type. (C)</p> Signup and view all the answers

    Which one of the following is a database operation that reads table blocks directly, without accessing an index?

    <p>Table scan (B)</p> Signup and view all the answers

    Which one of the following is a multi-level index that stores column values and row pointers in a hierarchy?

    <p>B+tree (C)</p> Signup and view all the answers

    Which one of the following is a subset of table data, usually a subset of rows rather than columns, stored on different computers of a distributed database?

    <p>Shard (A)</p> Signup and view all the answers

    Which one of the following is a balanced multi-level index where all branches are the same length?

    <p>B+tree (C)</p> Signup and view all the answers

    Which one of the following is a file containing column values, along with pointers to rows containing the column value?

    <p>Single-level index (D)</p> Signup and view all the answers

    Which operation in relational algebra combines two tables into one result, including all columns and all combinations of rows from both tables?

    <p>Product (C)</p> Signup and view all the answers

    What is the purpose of the rename operation in relational algebra?

    <p>To specify new table and column names (C)</p> Signup and view all the answers

    Which set operation in relational algebra combines all rows of two compatible tables into a single table, excluding duplicate rows?

    <p>Union (B)</p> Signup and view all the answers

    What is the purpose of the aggregate operation in relational algebra?

    <p>To apply aggregate functions (D)</p> Signup and view all the answers

    In the entity-relationship model, what is an entity?

    <p>A person, place, product, concept, or activity (A)</p> Signup and view all the answers

    Which normal form is achieved when all non-key columns depend on the whole primary key?

    <p>Second normal form (D)</p> Signup and view all the answers

    What is the purpose of normalization in database design?

    <p>To eliminate redundancy (B)</p> Signup and view all the answers

    Which storage media is typically used as the primary memory when computer programs execute?

    <p>Volatile memory (A)</p> Signup and view all the answers

    Which operator is used in a WHERE clause to determine if a value matches one of several values?

    <p>IN (B)</p> Signup and view all the answers

    What is the purpose of denormalization in database design?

    <p>To improve performance (C)</p> Signup and view all the answers

    Which operator provides an alternative way to determine if a value is between two other values?

    <p>BETWEEN (D)</p> Signup and view all the answers

    Which table structure imposes no order on the rows?

    <p>Heap table (C)</p> Signup and view all the answers

    What is a self-join?

    <p>A join that joins a table to itself (D)</p> Signup and view all the answers

    What is a cross-join?

    <p>A join that combines two tables without comparing columns (D)</p> Signup and view all the answers

    What is a subquery, sometimes called a nested query or inner query?

    <p>A query within another SQL query (A)</p> Signup and view all the answers

    Which keyword represents the highest column value in a partition?

    <p>MAXVALUE (B)</p> Signup and view all the answers

    What does a list partition associate each partition with?

    <p>An explicit list of partition expression values (C)</p> Signup and view all the answers

    What does a hash partition require for the partition expression?

    <p>Positive integer values (D)</p> Signup and view all the answers

    What is the partition number for each row computed as in a hash partition?

    <p>(partition expression value) modulo N (C)</p> Signup and view all the answers

    What is the difference between a key partition and a hash partition?

    <p>The partition expression is determined automatically in a key partition (C)</p> Signup and view all the answers

    Which of the following is true about cardinality in entity-relationship modeling?

    <p>Cardinality refers to the maximum and minimum number of instances of relationships and attributes. (B)</p> Signup and view all the answers

    What is the cardinality of a relationship when the maximum number of instances of one entity that can relate to a single instance of another entity is one?

    <p>One-to-One (B)</p> Signup and view all the answers

    What is an identifying attribute of an entity?

    <p>An identifying attribute is unique, singular, and required. (D)</p> Signup and view all the answers

    What is a strong entity in entity-relationship modeling?

    <p>A strong entity has one or more identifying attributes. (B)</p> Signup and view all the answers

    What is a weak entity in entity-relationship modeling?

    <p>A weak entity does not have an identifying attribute. (C)</p> Signup and view all the answers

    Which component of MySQL is responsible for managing connections from multiple users and compiling queries into low-level instructions for the storage engine?

    <p>Query processor (C)</p> Signup and view all the answers

    What is the purpose of the Audit component in MySQL?

    <p>Track all database changes (A)</p> Signup and view all the answers

    Which component of MySQL is responsible for executing instructions, managing indexes, and interacting with the file system?

    <p>Storage engine (D)</p> Signup and view all the answers

    What is the purpose of the Monitor component in MySQL?

    <p>Collect and display information on CPU and memory utilization (C)</p> Signup and view all the answers

    What is the purpose of the Utility programs component in MySQL?

    <p>Include installation, client, administrative, developer, and miscellaneous tools (B)</p> Signup and view all the answers

    What is the purpose of a connection in MySQL?

    <p>Manage connections from multiple users (A)</p> Signup and view all the answers

    What is an execution plan in MySQL?

    <p>A detailed, low-level sequence of steps that specify exactly how to process a query (B)</p> Signup and view all the answers

    Which type of database runs on multiple computers connected by a wide area network?

    <p>Distributed database (D)</p> Signup and view all the answers

    What is the purpose of the two-phase commit technique in distributed transactions?

    <p>To coordinate updates between participating nodes (C)</p> Signup and view all the answers

    In a distributed transaction, when does phase 2 begin?

    <p>When participating nodes receive confirmation from the transaction coordinator (B)</p> Signup and view all the answers

    What is the term used to describe updates in a distributed transaction that occur at the same time from the perspective of the database user?

    <p>Synchronous updates (B)</p> Signup and view all the answers

    What is the term used to describe databases that use local transactions instead of distributed transactions?

    <p>Eventually consistent databases (D)</p> Signup and view all the answers

    What is a replica in the context of replicated databases?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the purpose of the ETL process in data warehousing?

    <p>All of the above (D)</p> Signup and view all the answers

    Which tier of a multi-tier architecture consists of servers managing resources like databases and email?

    <p>Bottom tier (C)</p> Signup and view all the answers

    In a multi-tier architecture, what do the middle tiers execute?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the top tier of a web architecture responsible for?

    <p>Managing user interaction (A)</p> Signup and view all the answers

    What is the bottom tier of a web architecture composed of?

    <p>Services (A)</p> Signup and view all the answers

    What does Infrastructure-as-a-service (IaaS) provide to customers?

    <p>All of the above (D)</p> Signup and view all the answers

    What does Platform-as-a-service (PaaS) provide to customers?

    <p>All of the above (D)</p> Signup and view all the answers

    What does Software-as-a-service (SaaS) provide to customers?

    <p>Complete applications (A)</p> Signup and view all the answers

    Which of the following best describes a fact table in a database system?

    <p>A table that contains numeric data used to measure business performance. (B)</p> Signup and view all the answers

    What type of data does a dimension table contain?

    <p>Textual data that describes the fact data. (A)</p> Signup and view all the answers

    What is a dimension hierarchy in a database system?

    <p>A sequence of columns in which each column has a one-many relationship to the next column. (B)</p> Signup and view all the answers

    How many rows would a date dimension table contain if an organization tracks data for 100 years?

    <p>36,500 rows (C)</p> Signup and view all the answers

    How many rows would a time dimension table contain?

    <p>1,440 rows (A)</p> Signup and view all the answers

    What is the type 2 design for slowly changing dimensions in a fact table?

    <p>Adding start and end foreign keys to the fact table. (C)</p> Signup and view all the answers

    What is an in-memory database?

    <p>A database that stores data in main memory, instead of or in addition to storage media. (B)</p> Signup and view all the answers

    What is an embedded database?

    <p>A database that is packaged with a programming language. (A)</p> Signup and view all the answers

    What is a federated database?

    <p>A collection of two or more participating databases underneath a coordinating software layer. (B)</p> Signup and view all the answers

    Which tier of a web architecture consists of computers interacting directly with end-users?

    <p>Top tier (B)</p> Signup and view all the answers

    Which tier of a web architecture generates web pages for display on web browsers and transmits user requests to services running on lower tiers?

    <p>Middle tier (A)</p> Signup and view all the answers

    Which tier of a web architecture runs application software, processes user requests, and communicates with databases and other services?

    <p>Middle tier (A)</p> Signup and view all the answers

    Which tier of a web architecture comprises services such as database and authentication?

    <p>Bottom tier (A)</p> Signup and view all the answers

    Which type of computer architecture consists of multiple processors managed by a single operating system instance?

    <p>Parallel computer (C)</p> Signup and view all the answers

    In a shared memory computer, what do processors share?

    <p>Memory and storage media (B)</p> Signup and view all the answers

    In a shared storage computer, what do processors share?

    <p>Storage media only (C)</p> Signup and view all the answers

    Which component of MySQL is responsible for executing instructions, managing indexes, and interacting with the file system?

    <p>Storage engine (C)</p> Signup and view all the answers

    What is the purpose of the Monitor component in MySQL?

    <p>To collect and display information on CPU, memory, and index utilization (C)</p> Signup and view all the answers

    Which component of MySQL supports government and business audit requirements for sensitive databases?

    <p>Audit (A)</p> Signup and view all the answers

    What is the purpose of the Utility programs component in MySQL?

    <p>To provide various tools for installation, administration, and development (B)</p> Signup and view all the answers

    What is a connection in the context of MySQL?

    <p>A link between tools and the query processor (C)</p> Signup and view all the answers

    What is an execution plan in MySQL?

    <p>A detailed, low-level sequence of steps that specify exactly how to process a query (C)</p> Signup and view all the answers

    What is the purpose of the MySQL Enterprise Edition?

    <p>To provide a paid version of MySQL with additional features (B)</p> Signup and view all the answers

    Which of the following is true about a distributed transaction in a distributed database?

    <p>A distributed transaction updates data on multiple nodes of a distributed database. (A)</p> Signup and view all the answers

    What is the purpose of the two-phase commit technique in distributed transactions?

    <p>To instruct all nodes to commit the updates. (D)</p> Signup and view all the answers

    What is the difference between synchronous updates and asynchronous updates in a distributed transaction?

    <p>Synchronous updates occur at the same time from the perspective of the database user, while asynchronous updates occur at different times. (A)</p> Signup and view all the answers

    What is the term used to describe databases that use local transactions instead of distributed transactions?

    <p>Eventually consistent databases (B)</p> Signup and view all the answers

    What is a replica in the context of replicated databases?

    <p>All of the above (D)</p> Signup and view all the answers

    What is a data warehouse optimized for?

    <p>Analytics (C)</p> Signup and view all the answers

    What is the purpose of the ETL process in data warehousing?

    <p>All of the above (D)</p> Signup and view all the answers

    Which of the following best describes a fact table in a database system?

    <p>A fact table contains numeric data used to measure business performance. (D)</p> Signup and view all the answers

    What is a dimension table in a database system?

    <p>A dimension table contains textual data that describes the fact data. (C)</p> Signup and view all the answers

    What is a dimension hierarchy in a database system?

    <p>A dimension hierarchy is a sequence of columns in which each column has a one-many relationship to the next column. (A)</p> Signup and view all the answers

    How many rows does a date dimension table contain if an organization tracks data for 100 years?

    <p>36,500 rows (C)</p> Signup and view all the answers

    How many rows does a time dimension table contain?

    <p>1,440 rows (B)</p> Signup and view all the answers

    What is the type 2 design for slowly changing dimensions in a fact table?

    <p>Adding start and end foreign keys to the fact table. (A)</p> Signup and view all the answers

    What is an in-memory database?

    <p>A database that stores data in main memory, instead of or in addition to storage media. (B)</p> Signup and view all the answers

    What is an embedded database?

    <p>A database that is packaged with a programming language. (D)</p> Signup and view all the answers

    What is a federated database?

    <p>A collection of two or more participating databases underneath a coordinating software layer. (B)</p> Signup and view all the answers

    Which of the following is NOT a reason to include a year attribute in the sales tracking system?

    <p>To ensure uniqueness of the salesperson-product combination (D)</p> Signup and view all the answers

    What is the purpose of adding a year attribute to the sales tracking system?

    <p>To determine in which year a particular value of the Quantity attribute applies (D)</p> Signup and view all the answers

    In which scenario would the combination of Salesperson Number and Product Number NOT be unique?

    <p>When tracking sales on an annual basis (A)</p> Signup and view all the answers

    What is an example of an associative entity with its own unique identifier?

    <p>Motorist and Police Officer (B)</p> Signup and view all the answers

    What serves as the unique identifier for each traffic ticket in the example given?

    <p>Unique Serial Number (D)</p> Signup and view all the answers

    What is the purpose of including a year attribute in the sales tracking system?

    <p>To make it clear in which year a particular value of the Quantity attribute applies (C)</p> Signup and view all the answers

    Which type of entity is designed to list the attributes that directly describe the entity, with no complications involving other entities?

    <p>Entity box (B)</p> Signup and view all the answers

    What does the quantity attribute describe in an E-R diagram?

    <p>The combination of a particular salesperson and a particular product (B)</p> Signup and view all the answers

    In an E-R diagram, where is the intersection data, such as quantity, represented for a many-to-many relationship between salespersons and products?

    <p>In a separate box attached to the relationship line (A)</p> Signup and view all the answers

    When a many-to-many relationship is converted into an associative entity, what happens to the cardinalities and modalities?

    <p>They are reversed (A)</p> Signup and view all the answers

    What is the unique identifier of a many-to-many relationship or an associative entity in an E-R diagram?

    <p>The combination of the unique identifiers of the two entities in the relationship (D)</p> Signup and view all the answers

    What additional attribute(s) may need to be added to the combination of unique identifiers to ensure uniqueness in a many-to-many relationship or an associative entity?

    <p>An additional attribute related to a time element (B)</p> Signup and view all the answers

    Which type of unary relationship involves one person being married to another person and vice versa?

    <p>One-to-one (A)</p> Signup and view all the answers

    In the context of unary relationships, what does the modality of one rather than zero signify?

    <p>The situation where a salesperson does not have a backup (A)</p> Signup and view all the answers

    What does the downward branch out of the salesperson entity box in Figure 9.2.1b represent?

    <p>A salesperson managing zero to many other salespersons (A)</p> Signup and view all the answers

    What is the cardinality of a one-to-many unary relationship?

    <p>One entity can be associated with zero to many instances of another entity (D)</p> Signup and view all the answers

    What is the maximum number of instances of one entity that can relate to a single instance of another entity in a one-to-one unary relationship?

    <p>One (A)</p> Signup and view all the answers

    What does the one-to-one unary relationship called Back-Up involve in the context of the salesperson entity?

    <p>Organizing salespersons in pairs as backup to each other (C)</p> Signup and view all the answers

    Which symbol in an E-R diagram represents the multiple association?

    <p>The crow's foot (D)</p> Signup and view all the answers

    In a many-to-many binary relationship, what does it indicate?

    <p>A salesperson is authorized to sell many products (C)</p> Signup and view all the answers

    What does the 'inner' symbol represent in an E-R diagram?

    <p>The modality - the minimum number of entity occurrences involved in a relationship (C)</p> Signup and view all the answers

    Can the quantity attribute be added to the product entity box in a many-to-many relationship between salespersons and products?

    <p>No, because there would be lots of 'quantities', one for each salesperson selling the product (B)</p> Signup and view all the answers

    What does it mean when a company rule sets a limit of a maximum of ten customers in a sales territory?

    <p>A salesperson can have many customers but not more than 10 (D)</p> Signup and view all the answers

    What does the 'outer' symbol represent in an E-R diagram?

    <p>The cardinality - the maximum number of entity occurrences involved in a relationship (B)</p> Signup and view all the answers

    Which type of relationship involves three different entity types?

    <p>Ternary relationship (B)</p> Signup and view all the answers

    In a many-to-many unary relationship, how are the parts related to each other?

    <p>Each part is a component of several other parts (C)</p> Signup and view all the answers

    What does a binary relationship represent in an E-R diagram?

    <p>A relationship between two entity types (D)</p> Signup and view all the answers

    What does a one-to-one (1-1) binary relationship mean?

    <p>A single occurrence of one entity type can be associated with a single occurrence of the other entity type (B)</p> Signup and view all the answers

    What does a one-to-many (1-M) binary relationship represent?

    <p>A relationship between two entity types where multiple occurrences of one entity type can be associated with a single occurrence of the other entity type (A)</p> Signup and view all the answers

    What does the "bar" or "one" symbol indicate in an E-R diagram?

    <p>The minimum one cardinality (B)</p> Signup and view all the answers

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