SQL Data Types Quiz
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Questions and Answers

What is the role of a database administrator?

  • Translating query processor instructions into low-level file-system commands
  • Ensuring transactions are properly executed
  • Interpreting queries and creating a plan to modify the database
  • Enforcing procedures for user access and database system availability (correct)

    • What is the purpose of database authorization?

  • Interpreting queries and creating a plan to modify the database
  • Ensuring transactions are properly executed
  • Authorizing individual users to access specific data (correct)
  • Enforcing procedures for user access and database system availability

    • What does the query processor do?

  • Translating query processor instructions into low-level file-system commands
  • Ensuring transactions are properly executed
  • Securing the database system against unauthorized users
  • Interpreting queries and creating a plan to modify the database (correct)

    • Why does the storage manager use indexes?

    <p>To quickly locate data in large databases</p> Signup and view all the answers

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

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

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

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

    Which index type contains an entry for every table block?

    <p>Sparse index</p> Signup and view all the answers

    What database operation reads index blocks sequentially?

    <p>Index scan</p> Signup and view all the answers

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

    <p>Tablespace</p> Signup and view all the answers

    Which function translates instructions generated by a query processor into low-level commands that access data on storage media?

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

    What specifies indexes, table structures, and partitions?

    <p>Physical design</p> Signup and view all the answers

    In which type of index are index entries assigned to buckets?

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

    What is the purpose of a primary key in SQL?

    <p>To identify a row uniquely</p> Signup and view all the answers

    Which SQL constraint ensures referential integrity?

    <p>Foreign key constraint</p> Signup and view all the answers

    What does the TRUNCATE statement do in SQL?

    <p>Deletes all rows in a table</p> Signup and view all the answers

    What is the purpose of the WHERE clause in SQL?

    <p>To delete specific rows based on a condition</p> Signup and view all the answers

    Which SQL operator is used for exponentiation?

    <p>^</p> Signup and view all the answers

    What are TINYINT, SMALLINT, INTEGER, MEDIUMINT, and BIGINT in SQL?

    <p>Data types for integer values</p> Signup and view all the answers

    What does the UPDATE statement do in SQL?

    <p>Modifies existing rows</p> Signup and view all the answers

    In SQL, what does the entity-relationship model represent?

    <p>A high-level representation of data requirements</p> Signup and view all the answers

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

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

    What do self-joins, cross-joins, materialized views, and subqueries represent in SQL?

    <p>Advanced SQL concepts</p> Signup and view all the answers

    What type of relationship relates an entity to itself in SQL?

    <p>Reflexive relationship</p> Signup and view all the answers

    Which SQL statement is used to delete specific rows based on a condition?

    <p>DELETE</p> Signup and view all the answers

    What is the responsibility of the transaction manager?

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

    What operations does MongoDB support?

    <p>INSERT, SELECT, UPDATE, DELETE</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</p> Signup and view all the answers

    What is the purpose of the logical design phase?

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

    What is the principle of data independence?

    <p>Ensuring query results are not affected by physical design changes</p> Signup and view all the answers

    Which API is used to execute SQL statements?

    <p>MySQL Command-Line Client</p> Signup and view all the answers

    What is a tuple in the context of databases?

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

    What are business rules based on?

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

    What are the sublanguages of SQL?

    <p>DDL, DQL, DML, DCL, DTL</p> Signup and view all the answers

    What does the CREATE TABLE statement do in SQL?

    <p>Creates a new table with specified column names and data types</p> Signup and view all the answers

    What are the integer data types in SQL?

    <p>INT (4 bytes) and SMALLINT (2 bytes)</p> Signup and view all the answers

    What does the physical design phase involve?

    <p>Adding indexes and optimizing table organization on storage media</p> Signup and view all the answers

    What is the primary purpose of an entity-relationship diagram (ER diagram)?

    <p>To visually represent entities, relationships, and attributes</p> Signup and view all the answers

    In an ER diagram, how are entities typically represented?

    <p>As rectangles with types and instances</p> Signup and view all the answers

    What is the purpose of cardinality in an ER diagram?

    <p>To specify the maximum and minimum number of instances of one entity that can relate to another</p> Signup and view all the answers

    What are primary keys in the context of database tables?

    <p>Unique identifiers for tables that should be stable, simple, and meaningless</p> Signup and view all the answers

    What does normalization aim to achieve in database design?

    <p>To eliminate redundancy and minimize data anomalies</p> Signup and view all the answers

    What notation is commonly used in ER diagrams to depict cardinality?

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

    What is the role of analysis in creating an ER diagram?

    <p>To discover entities, relationships, and attributes</p> Signup and view all the answers

    What type of entities are subtype entities in an ER diagram?

    <p>A subset of a supertype entity</p> Signup and view all the answers

    What best describes the purpose of attribute representation in an ER diagram?

    <p>Attributes represent sets of values transformed into tables.</p> Signup and view all the answers

    What is the significance of data normalization in database design?

    <p>Normalization eliminates redundancy and minimizes data anomalies.</p> Signup and view all the answers

    How are trivial dependencies related to normalization in database tables?

    <p>Trivial dependencies occur when one column is a subset of another, and normalization eliminates this redundancy.</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 of SQL data types with this quiz. Learn about TINYINT, SMALLINT, MEDIUMINT, INTEGER, INT, and BIGINT data types and their storage and range.

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