SQL Data Types Quiz
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Questions and Answers

What is the role of a database administrator?

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

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

  • Storing and retrieving data efficiently
  • Translating query processor instructions into low-level file-system commands
  • Securing the database system against unauthorized users
  • Interpreting queries and creating a plan to modify the database or retrieve data (correct)

    • Why does the storage manager use indexes in database systems?

  • To enforce procedures for user access and database system availability
  • To quickly locate data in databases of varying sizes (correct)
  • To secure the database system against unauthorized users
  • To ensure data consistency with structural and business rules

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

    <p>Ensuring proper execution of transactions</p> Signup and view all the answers

    What is a hash table in a database?

    <p>A structure that assigns rows to buckets for faster retrieval</p> Signup and view all the answers

    What is the purpose of a tablespace in a database?

    <p>To map one or more tables to a single file</p> Signup and view all the answers

    What does a table cluster, also called multi-table, do in a database?

    <p>Interleaves rows of two or more tables in the same storage area</p> Signup and view all the answers

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

    <p>To translate instructions generated by a query processor into low-level commands that access data on storage media</p> Signup and view all the answers

    What does hit ratio, also called filter factor or selectivity, represent in a database?

    <p>The percentage of table rows selected by a query</p> Signup and view all the answers

    What is the function of a dense index in a database?

    <p>Contains an entry for every table row</p> Signup and view all the answers

    What does a table scan do in a database?

    <p>Reads table blocks directly without accessing an index</p> Signup and view all the answers

    What SQL statement is used to modify existing rows in a table?

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

    Which SQL data type includes TINYINT, SMALLINT, and INTEGER?

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

    What is the purpose of a primary key in SQL?

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

    What does the FOREIGN KEY constraint ensure in SQL?

    <p>It rejects insert, update, or delete statements that violate referential integrity</p> Signup and view all the answers

    Which SQL operator allows determining if a value falls between two other values?

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

    What type of view in SQL stores data and is refreshed when the base table changes?

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

    What is the purpose of a subquery in SQL?

    <p>To use the result of one query within another query</p> Signup and view all the answers

    What does the WITH CHECK OPTION specify in SQL?

    <p>It rejects inserts and updates that do not satisfy the view query's WHERE clause</p> Signup and view all the answers

    What represents data requirements at a high level in an entity-relationship model?

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

    What does an attribute represent in an entity-relationship model?

    <p>Descriptive property of an entity</p> Signup and view all the answers

    What does a reflexive relationship relate in an entity-relationship model?

    <p>Entity to itselft</p> Signup and view all the answers

    What does an ER diagram represent?

    <p>Entities, relationships, and attributes</p> Signup and view all the answers

    How are entities typically represented in an ER diagram?

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

    What do entity types and relationship types represent in an ER diagram?

    <p>Sets of things and sets of related things</p> Signup and view all the answers

    What is the purpose of cardinality in an ER diagram?

    <p>Refers to the maximum and minimum number of instances that can relate to each other</p> Signup and view all the answers

    What is the relationship between subtype entities and supertype entities in an ER diagram?

    <p>Subtype entities are a subset of a supertype entity, and are documented but not tracked with data in the database</p> Signup and view all the answers

    What is the purpose of logical design in database systems?

    <p>Converts the entity-relationship model into tables, columns, and keys for a specific database system</p> Signup and view all the answers

    What are primary keys in database tables?

    <p>Stable, simple, and meaningless, and should uniquely identify each row</p> Signup and view all the answers

    What is functional dependence in the context of database tables?

    <p>The relationship between one column and another</p> Signup and view all the answers

    What does normalization aim to achieve in database design?

    <p>Rules for designing tables with less redundancy</p> Signup and view all the answers

    When is a table considered to be in third normal form (3NF)?

    <p>If non-key columns depend only on the primary key</p> Signup and view all the answers

    What is the purpose of normalization in database design?

    <p>Eliminates redundancy by decomposing a table into two or more tables</p> Signup and view all the answers

    What is denormalization in the context of databases?

    <p>Intentionally introduces redundancy by merging tables</p> Signup and view all the answers

    What is the primary responsibility of the transaction manager?

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

    Which database system is described as a NoSQL, open-source database system?

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

    What are the possible operations that can be performed in MongoDB?

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

    Which sublanguage of SQL is used for managing and manipulating relational databases?

    <p>Data Definition Language (DDL)</p> Signup and view all the answers

    In logical database design, what are entities, relationships, and attributes converted into?

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

    What is added during the physical design stage of database design?

    <p>Indexes and storage media</p> Signup and view all the answers

    What is the MySQL Command-Line Client used for?

    <p>Executing SQL statements</p> Signup and view all the answers

    What does a table in a relational database consist of?

    <p>Name, fixed sequence of columns, varying set of rows</p> Signup and view all the answers

    How is data structured in a relational database?

    <p>In tables with specific columns and data types</p> Signup and view all the answers

    Study Notes

    • The transaction manager is responsible for preventing conflicts between concurrent transactions and restoring the database to a consistent state in the event of a failure.
    • MongoDB is a NoSQL, open-source database system. In it, data can be INSERTed, SELECTed, UPDATEd, or DELETEd from tables.
    • SQL is a language used for managing and manipulating relational databases. It includes the following sublanguages: Data Definition Language (DDL), Data Query Language (DQL), Data Manipulation Language (DML), Data Control Language (DCL), and Data Transaction Language (DTL).
    • In logical database design, entities, relationships, and attributes are converted into tables, keys, and columns.
    • Physical design adds indexes and determines how tables are organized on storage media, affecting query processing speed but never the query results.
    • The MySQL Command-Line Client is a text interface for the MySQL Server, used for executing SQL statements.
    • A table in a relational database consists of a name, a fixed sequence of columns, and a varying set of rows. A column has a name and a data type, and a row is an unnamed sequence of values that correspond to the columns.
    • Data is structured in tables, allowing each value to belong to a specific column and its data type.
    • Business rules are based on business policy and specific to a particular database. They can include literals, keywords, identifiers, and comments.
    • SQL uses an application programming interface to simplify use with a general-purpose language.
    • Existing tables can be modified using the ALTER TABLE statement.
    • Integer data types represent positive and negative integers and are allocated varying amounts of storage (e.g., INT, INTEGER, SMALLINT).

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    Description

    Test your knowledge of SQL data types with this quiz. From TINYINT to BIGINT, can you match the data type with its description and storage requirements?

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