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Computer science · lesson 4 of 4

Transactions and safe querying

A group of database operations treated as one logical unit.

University8 practice questionsNotes + worked examples
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Learn the ideas

Prerequisites: Basic computing and simple data tables.

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

Example 1

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

Example 2

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

8 questions

Decimals or fractions are accepted for numeric answers. Proofs and written responses use sample answers and require human marking. This is practice, not a protected examination.

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

Show answer and explanation

Transaction

Transaction is the matching concept in this lesson.

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

Show answer and explanation

Parameterized query

Parameterized query is the matching concept in this lesson.

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

Show answer and explanation

Constraint

The scenario directly calls for Constraint.

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

Show answer and explanation

Least privilege

The intended concept is Least privilege.

5 Which statement about Transaction is most accurate?

Show answer and explanation

A group of database operations treated as one logical unit.

The definition in the lesson notes gives the required condition.

6 Explain one important difference between Transaction and Parameterized query.

Sample answer and marking guidance

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.

7 Give a short example showing how Constraint would be used in practice.

Sample answer and marking guidance

A valid example should demonstrate this idea: A database rule that rejects invalid states or values.

Credit a relevant scenario that applies the concept rather than merely naming it.

8 Summarize why Least privilege matters in the lesson “Transactions and safe querying”.

Sample answer and marking guidance

Least privilege matters because Granting only the permissions required for a task.

Credit the core purpose, scope and any important limitation from the notes.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.