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  3. Transactions and Error Handling in SQL Server

Exercise

Choosing when to commit or rollback a transaction

The bank where you work has decided to give $100 to those accounts with less than $5,000. However, the bank director only wants to give that money if there aren't more than 200 accounts with less than $5,000.

You prepare a script to give those $100, and of the multiple ways of doing it, you decide to open a transaction and then update every account with a balance of less than $5,000. After that, you check the number of the rows affected by the update, using the @@ROWCOUNT function. If this number is bigger than 200, you rollback the transaction. Otherwise, you commit it.

How do you prepare the script?

Instructions

100 XP
  • Begin the transaction.
  • Check if the number of affected rows is bigger than 200.
  • Rollback the transaction if the number of affected rows is more than 200.
  • Commit the transaction if the number of affected rows is less than or equal to 200.