Database Design Concepts
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What is the purpose of the INSERT statement in SQL?

  • To remove rows from a table
  • To insert data into a table (correct)
  • To grant access privileges to a database user
  • To update the values of a column in a table
  • When using DML commands in SQL, what does the COMMIT command do?

  • Save all the transactions to the database (correct)
  • Revoke permissions from users
  • Undo transactions that have not been saved
  • Update the values of columns
  • Which SQL command is used to remove rows from a table?

  • REVOKE
  • UPDATE
  • DELETE (correct)
  • SELECT
  • What is the purpose of the DCL command 'Revoke' in SQL?

    <p>Remove access privileges from a database user (B)</p> Signup and view all the answers

    In SQL, what type of commands can be controlled by TCL commands?

    <p>Data Manipulation Language (DML) commands (B)</p> Signup and view all the answers

    What is the purpose of the SAVEPOINT command in SQL?

    <p>Roll back the transaction to a specific point (B)</p> Signup and view all the answers

    'Grant' and 'Revoke' are examples of commands in which category of SQL commands?

    <p>'Grant' and 'Revoke' are DCL commands (A)</p> Signup and view all the answers

    'SELECT' command in SQL is used for which purpose?

    <p>Fetch data from the database (B)</p> Signup and view all the answers

    'Rollback' command in SQL is used for what purpose?

    <p>'Rollback' is used to undo transactions not saved to the database (B)</p> Signup and view all the answers

    What does an entity represent in a database management system?

    <p>A real-world object or concept like a person or place (D)</p> Signup and view all the answers

    How are attributes typically represented in an ER diagram?

    <p>As ovals connected to entities (C)</p> Signup and view all the answers

    In an ER diagram, how are relationships between entities depicted?

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

    What is the primary function of a primary key in an ER diagram?

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

    How does an ER diagram help in database management?

    <p>By visually representing entity sets and their relationships (C)</p> Signup and view all the answers

    Which symbol is typically used to represent an attribute in an ER diagram?

    <p>Oval connected to an entity (A)</p> Signup and view all the answers

    What is the main purpose of an ER diagram in database design?

    <p>To visually represent relationships among entities (A)</p> Signup and view all the answers

    Which component of an ER Diagram represents a real-world object or concept?

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

    What does a Primary Key serve as in an ER diagram?

    <p>A unique identifier for each record in an entity (B)</p> Signup and view all the answers

    In an ER diagram, how are relationships between entities usually depicted?

    <p>As diamond shapes (D)</p> Signup and view all the answers

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