[Solved] Consider this SQL transaction:BEGIN TRANSACTION; UPDATE inventory SET quantity = quantity - 5 WHERE product_id = 10;... ROLLBACK;What will be the final effect on the database? | SQL

SQL - Transactions and Data Integrity

Consider this SQL transaction:

BEGIN TRANSACTION;
UPDATE inventory SET quantity = quantity - 5 WHERE product_id = 10;
UPDATE sales SET total = total + 5 WHERE sale_id = 3;
ROLLBACK;

What will be the final effect on the database?

ABoth updates will be saved permanently

BNo changes will be saved to the database

COnly the first update will be saved

DOnly the second update will be saved

Step-by-Step Solution

Solution:

Step 1: Understand the effect of ROLLBACK
ROLLBACK cancels all changes made in the current transaction, undoing updates.
Step 2: Analyze the transaction steps
Two updates happen, but ROLLBACK is called before COMMIT, so none of the changes are saved.
Final Answer:
No changes will be saved to the database -> Option B
Quick Check:
ROLLBACK cancels changes = C [OK]

Quick Trick: ROLLBACK undoes all changes in a transaction [OK]

Common Mistakes:

Assuming updates save without COMMIT
Thinking partial updates remain after ROLLBACK
Confusing ROLLBACK with COMMIT

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Consider this SQL transaction:

Step 1: Understand the effect of ROLLBACK

Step 2: Analyze the transaction steps

Final Answer:

Quick Check:

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