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Computer science · University

Transactions and safe querying

A group of database operations treated as one logical unit.

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Prerequisites

Basic computing and simple data tables.

Study notes

Transaction

A group of database operations treated as one logical unit.

Parameterized query

A query that keeps data values separate from SQL syntax.

Constraint

A database rule that rejects invalid states or values.

Least privilege

Granting only the permissions required for a task.

Worked examples

Which term best matches this description: A group of database operations treated as one logical unit.

Transaction is the matching concept in this lesson.

Transaction

Which term best matches this description: A query that keeps data values separate from SQL syntax.

Parameterized query is the matching concept in this lesson.

Parameterized query

Check your understanding

  1. Which concept would you apply first in a situation where a database rule that rejects invalid states or values.

    1. Least privilege
    2. Parameterized query
    3. Constraint
    4. Transaction

  2. Name the concept described as: Granting only the permissions required for a task.

  3. Which statement about Transaction is most accurate?

    1. A group of database operations treated as one logical unit.
    2. A query that keeps data values separate from SQL syntax.
    3. A database rule that rejects invalid states or values.
    4. Granting only the permissions required for a task.

  4. Explain one important difference between Transaction and Parameterized query.

Answers and marking guidance

Answers and marking notes
  1. Constraint

    The scenario directly calls for Constraint.

  2. Least privilege

    The intended concept is Least privilege.

  3. A group of database operations treated as one logical unit.

    The definition in the lesson notes gives the required condition.

  4. Transaction: A group of database operations treated as one logical unit. Parameterized query: A query that keeps data values separate from SQL syntax.

    Credit a clear distinction using both definitions and an appropriate example if supplied.

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