How can you use transaction control in SQL Server?

In SQL Server, you can use BEGIN TRANSACTION, COMMIT, and ROLLBACK statements to implement transaction control. Here is a simple example:

BEGIN TRANSACTION

UPDATE table_name
SET column1 = value1
WHERE condition;

DELETE FROM table_name
WHERE condition;

COMMIT;

In the example above, BEGIN TRANSACTION indicates the start of a transaction, UPDATE and DELETE statements are used to modify data in the database, and finally, the COMMIT statement is used to commit the transaction. If an error occurs during the transaction process or if it is necessary to rollback previous operations, the ROLLBACK statement can be used to cancel the previous modifications.

It is important to note that transaction control requires ensuring that database tables support transactions, and the behavior of transactions can be controlled by setting the transaction isolation level of the database. In SQL Server, the SET TRANSACTION ISOLATION LEVEL statement can be used to set the transaction isolation level, with commonly used levels including READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, and SERIALIZABLE.