SQL TCL Basics Quiz

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| Questions: 15 | Updated: May 1, 2026
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1. What does TCL stand for in SQL?

Explanation

TCL stands for Transaction Control Language, which is a subset of SQL used to manage transactions in a database. It includes commands like COMMIT, ROLLBACK, and SAVEPOINT, allowing users to control the execution of transactions, ensuring data integrity and consistency during operations.

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About This Quiz
SQL TCL Basics Quiz - Quiz

This SQL TCL Basics Quiz evaluates your understanding of Transaction Control Language in SQL. Learn to manage database transactions using COMMIT, ROLLBACK, and SAVEPOINT commands. Essential for college-level database management, this quiz tests your ability to control transaction lifecycles, ensure data consistency, and handle concurrency scenarios in relational databases.

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2. Which TCL command makes all pending transactions permanent in the database?

Explanation

The COMMIT command in TCL (Transaction Control Language) is used to make all changes made during the current transaction permanent in the database. It finalizes the transaction, ensuring that all modifications are saved and visible to other users, while also releasing any locks held during the transaction.

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3. What is the primary purpose of the ROLLBACK command?

Explanation

The ROLLBACK command is used in database management to revert the database to its last stable state by undoing all changes that have not been committed. This ensures data integrity by allowing users to discard any incomplete or erroneous transactions before they are permanently saved.

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4. SAVEPOINT allows you to ______ within a transaction without rolling back the entire transaction.

Explanation

SAVEPOINT is a feature in database transactions that enables the creation of a specific point within a transaction. This allows users to roll back to that point if needed, without affecting the entire transaction. It provides flexibility in managing complex transactions by isolating parts of the operation for potential reversal.

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5. In SQL, a transaction begins automatically when you execute a DML statement. True or False?

Explanation

In SQL, a transaction is initiated automatically when a Data Manipulation Language (DML) statement, such as INSERT, UPDATE, or DELETE, is executed. This ensures that the changes made by the DML statement can be committed or rolled back as a single unit, maintaining data integrity and consistency within the database.

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6. Which command would you use to undo changes made after a specific SAVEPOINT?

Explanation

ROLLBACK TO SAVEPOINT allows you to revert the database state to a specific point in a transaction, effectively undoing changes made after that SAVEPOINT. This command is useful for managing transactions and ensuring data integrity, as it enables selective rollback without affecting earlier operations.

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7. What is the atomicity property in ACID transactions?

Explanation

Atomicity in ACID transactions ensures that a transaction is treated as a single, indivisible unit. This means that either all operations within the transaction are completed successfully, or none are applied, preventing partial updates that could lead to data inconsistency. This guarantees the integrity of the database in case of failures.

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8. A SAVEPOINT name must be ______ within a single transaction.

Explanation

A SAVEPOINT name must be unique within a single transaction to ensure that each point can be distinctly referenced. This uniqueness prevents confusion when rolling back to a specific SAVEPOINT, allowing for precise control over transaction management and ensuring that the intended state of the transaction can be accurately restored.

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9. Which of the following is NOT a TCL command?

Explanation

TCL (Transaction Control Language) commands manage transactions in a database. COMMIT, ROLLBACK, and SAVEPOINT are all used to control transaction states. In contrast, INSERT is a DML (Data Manipulation Language) command used for adding data to tables, making it the option that does not belong to the TCL category.

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10. In autocommit mode, each DML statement is automatically committed. True or False?

Explanation

In autocommit mode, every Data Manipulation Language (DML) statement, such as INSERT, UPDATE, or DELETE, is automatically committed to the database immediately after execution. This means that changes are permanently saved without needing an explicit COMMIT command, ensuring that each operation is finalized as soon as it is completed.

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11. The RELEASE SAVEPOINT command ______ a previously created savepoint from memory.

Explanation

The RELEASE SAVEPOINT command is used in database management to eliminate a previously established savepoint. This action frees up memory resources and ensures that the savepoint can no longer be used for rollbacks, thus streamlining transaction management and maintaining database integrity.

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12. What happens if you COMMIT a transaction with no changes?

Explanation

When you commit a transaction that has no changes, the database recognizes that there are no modifications to apply. Therefore, the transaction is considered successful, but it does not alter the state of the database. It essentially confirms that no updates were needed, resulting in no effect on the data.

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13. Which isolation level allows dirty reads, non-repeatable reads, and phantom reads?

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14. A ______ is a named checkpoint within a transaction that allows partial rollback.

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15. After a ROLLBACK TO SAVEPOINT, the transaction is automatically terminated. True or False?

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What does TCL stand for in SQL?
Which TCL command makes all pending transactions permanent in the...
What is the primary purpose of the ROLLBACK command?
SAVEPOINT allows you to ______ within a transaction without rolling...
In SQL, a transaction begins automatically when you execute a DML...
Which command would you use to undo changes made after a specific...
What is the atomicity property in ACID transactions?
A SAVEPOINT name must be ______ within a single transaction.
Which of the following is NOT a TCL command?
In autocommit mode, each DML statement is automatically committed....
The RELEASE SAVEPOINT command ______ a previously created savepoint...
What happens if you COMMIT a transaction with no changes?
Which isolation level allows dirty reads, non-repeatable reads, and...
A ______ is a named checkpoint within a transaction that allows...
After a ROLLBACK TO SAVEPOINT, the transaction is automatically...
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