A Transaction is a sequence of one or more SQL statements executed as a single unit. Either every statement succeeds and the changes are saved, or an error occurs and all changes are reversed, ensuring data consistency.
Transactions protect business data from becoming inconsistent. Banking systems, payment applications, inventory management, and financial software rely on transactions to ensure that all related operations succeed together.
When transferring money between two bank accounts, the amount must be deducted from one account and added to another. If either operation fails, neither change should be saved.
BEGIN TRANSACTION;
UPDATE Accounts
SET Balance = Balance - 5000
WHERE AccountID = 101;
UPDATE Accounts
SET Balance = Balance + 5000
WHERE AccountID = 102;
COMMIT;Transactions are essential in banking, e-commerce, payroll systems, inventory management, airline reservations, healthcare applications, and financial reporting.
- Groups multiple SQL statements together.
- Maintains data consistency.
- Supports COMMIT and ROLLBACK.
- Either all operations succeed or none succeed.
- Essential for financial applications.
- Protects data integrity.
- Follows ACID principles.
What is a Transaction in SQL?
A Transaction is a group of SQL statements executed as one logical unit of work.
Why are Transactions important?
They ensure that related database operations either complete successfully together or are completely reversed.