Data Types and Ranges Quiz
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Questions and Answers

What is the primary responsibility of a database administrator?

  • Creating efficient indexes for database storage
  • Enforcing procedures for user access and database system availability (correct)
  • Translating query processor instructions into low-level file-system commands
  • Interpreting and executing queries

    • What is the main function of the query processor in a database system?

  • Interpreting queries and creating a plan to modify or retrieve data (correct)
  • Translating query processor instructions into low-level file-system commands
  • Creating efficient indexes for database storage
  • Ensuring data consistency with structural and business rules

    • What is the purpose of the storage manager in a database system?

  • Enforcing procedures for user access and database system availability
  • Ensuring transactions are properly executed
  • Translating query processor instructions into low-level file-system commands
  • Creating efficient indexes for database storage (correct)

    • What is the role of the transaction manager in a database system?

    <p>Ensuring transactions are properly executed (B)</p> Signup and view all the answers

    Which type of table is particularly fast for bulk load of many rows?

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

    What kind of function is the modulo function in a hash table?

    <p>Simple hash function (A)</p> Signup and view all the answers

    What is the percentage of table rows selected by a query known as?

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

    What type of index contains an entry for every table row?

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

    Which database object maps one or more tables to a single file?

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

    What does logical design specify in a database?

    <p>Tables, columns, and keys (C)</p> Signup and view all the answers

    What does a storage engine or storage manager translate into low-level commands?

    <p>Instructions generated by a query processor (D)</p> Signup and view all the answers

    What SQL statement is used to create an index?

    <p><code>CREATE INDEX</code> (A)</p> Signup and view all the answers

    Which statement best describes the responsibility of a transaction manager?

    <p>Preventing conflicts between concurrent transactions and restoring a database to a consistent state in case of failure (A)</p> Signup and view all the answers

    Which operation is supported by MongoDB?

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

    What does the SQL's CREATE TABLE statement do?

    <p>Defines a new table with specified names and data types (B)</p> Signup and view all the answers

    What is the purpose of the logical design phase in database design?

    <p>Converts entities, relationships, and attributes into tables, keys, and columns (C)</p> Signup and view all the answers

    What is the main function of an application programming interface (API) like MySQL Command-Line Client?

    <p>Used to execute SQL statements (B)</p> Signup and view all the answers

    What is a tuple in the context of databases?

    <p>An ordered collection of elements (B)</p> Signup and view all the answers

    What are business rules based on in the context of databases?

    <p>Specific database requirements (B)</p> Signup and view all the answers

    Which SQL data type has the largest storage size and range among the given options?

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

    Which SQL operator is used for exponentiation?

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

    What SQL statement is used for deleting all rows in a table?

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

    In SQL, what does a foreign key constraint ensure?

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

    Which SQL constraint is used to enforce data validation rules on a table?

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

    Which SQL keyword is used to modify table data and structure?

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

    What is a high-level representation of data requirements in SQL that includes entities, relationships, and attributes?

    <p>Entity-relationship model (D)</p> Signup and view all the answers

    What does a reflexive relationship relate in SQL?

    <p>An entity to itself (D)</p> Signup and view all the answers

    Which SQL join combines each row from the first table with every row from the second table?

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

    What does a primary key constraint prevent in SQL?

    <p>Inserting duplicate values (D)</p> Signup and view all the answers

    In SQL, what does the % operator calculate?

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

    Which clause is used in SQL to specify the conditions that must be met for the records to be selected during a query?

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

    In an entity-relationship diagram (ER diagram), how are entities represented?

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

    What does cardinality refer to in an ER diagram?

    <p>The maximum and minimum number of instances of one entity that can relate to a single instance of another entity (C)</p> Signup and view all the answers

    What is the purpose of primary keys in a table?

    <p>To uniquely identify a record (D)</p> Signup and view all the answers

    What is the first step in creating an ER diagram?

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

    What does data modeling progress through after analysis in the context of ER diagrams?

    <p>Logical design, analysis, physical design (A)</p> Signup and view all the answers

    What is the relationship between one column and another in the context of functional dependence?

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

    How are subtype entities documented within the supertype entity in an ER diagram?

    <p>As a subset of the supertype entity (C)</p> Signup and view all the answers

    What does normalization aim to achieve in a table?

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

    Which notation is used in ER diagrams to depict cardinality?

    <p>Crow's foot notation (A)</p> Signup and view all the answers

    What happens when tables are in various normal forms?

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

    What does a primary key represent for a table?

    <p>To uniquely identify a record (A)</p> Signup and view all the answers

    What is the role of an intangible entity in a database?

    <p>It is not documented (D)</p> Signup and view all the answers

    Study Notes

    • An entity-relationship diagram (ER diagram) is a visual representation of entities, relationships, and attributes
    • Entities are represented as rectangles, with types being sets of things (e.g., all employees in a company) and instances being individual things (e.g., the employee Sam Snead)
    • Types of entities include entity types (sets of things) and relationship types (sets of related things)
    • Attributes are represented as sets of values and are usually transformed into tables, columns, and keys, respectively
    • Analysis is the first step in creating an ER diagram, during which entities, relationships, and attributes are discovered
    • Cardinality refers to the maximum and minimum number of instances of one entity that can relate to a single instance of another entity
    • Subtype entities are a subset of a supertype entity and are documented within the supertype entity in an ER diagram
    • Primary keys are unique identifiers for a table that should be stable, simple, and meaningless
    • Data modeling progresses through steps of analysis, logical design, and physical design
    • Functional dependence is the relationship between one column and another, and normalization is the process of eliminating redundancy in a table
    • ER diagrams use crow's foot notation to depict cardinality
    • An intangible entity is documented but not tracked with data in the database
    • Tables can be in various normal forms (e.g., third normal form, Boyce-Codd normal form) to minimize redundancy
    • Trivial dependencies occur when one column is a subset of another, and normalization eliminates this redundancy
    • Databases can have different table structures, such as heap tables with no imposed order on rows.

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    Description

    Test your knowledge on data types and their ranges with this quiz. From TINYINT to BIGINT, this quiz covers the different integer data types and their storage capacities.

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