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Give detail description on Transactions.
- Using transactions we can group all SQL commands into a single unit.
- Transaction begins with some task and finishes only when all tasks within it are over.
- Transaction gets over successfully only when all commands in it are successfully over. Even if one command fails, whole transaction fails.
- BEGIN TRANSACTION, ROLLBACK TRANSACTION, and COMMIT TRANSACTION statements are used to work with transactions.
- A group of tasks starts with begin statement.
- Just in case of any problem, rollback command is executed to abort transaction.
- If all tasks run successfully, all commands are executed through commit statement.
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