Solution:Step 1: Understand transaction failure behaviorIf an operation inside a transaction fails, the transaction typically enters a failed or aborted state depending on the DBMS.Step 2: Analyze the code flowThe UPDATE fails, so the transaction is rolled back automatically or no changes are saved

[Solved] Given this SQL code:BEGIN TRANSACTION; UPDATE accounts SET balance = balance - 50 WHERE id = 1; COMMIT;What happens if the UPDATE statement fails? | SQL

SQL - Transactions and Data Integrity

Given this SQL code:

BEGIN TRANSACTION;
UPDATE accounts SET balance = balance - 50 WHERE id = 1;
COMMIT;

What happens if the UPDATE statement fails?

AThe database shuts down to prevent errors

BThe transaction commits anyway, saving partial changes

CThe transaction remains open until manually rolled back

DThe transaction is rolled back automatically, no changes saved

Step-by-Step Solution

Solution:

Step 1: Understand transaction failure behavior
If an operation inside a transaction fails, the transaction typically enters a failed or aborted state depending on the DBMS.
Step 2: Analyze the code flow
The UPDATE fails, so the transaction is rolled back automatically or no changes are saved depending on DBMS behavior.
Final Answer:
The transaction is rolled back automatically, no changes saved -> Option D
Quick Check:
Failed operation inside transaction = automatic rollback or no commit [OK]

Quick Trick: Failed statements inside transactions cause rollback or no commit [OK]

Common Mistakes:

Assuming partial changes are saved on failure
Thinking COMMIT runs despite errors

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Given this SQL code:

Step 1: Understand transaction failure behavior

Step 2: Analyze the code flow

Final Answer:

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