8. トランザクションとは？

データベースにはトランザクションという概念があります。複数のコマンドを1つにまとめた単位です。

BEGINキーワードで開始し、Commitするとディスクに書き込まれます。トランザクションが正常に完了しなかった場合はROLLBACKする必要があります。

Stay tuned for That. There's another example of how a transaction works. We talk about this in an forEachTrailingCommentRange, let's have this as a table right. The balance for Account ID 1 is 1000 USD. We want to sent $100 from account one to account two How whould you build it, Stop this recording and then do it yourself and then movo on Obviously the slides are available for you, if you want to do it yourself

You begin a transaction transaction number one and then we select the balance from account whare ID equal onemptied You can put this int the application like what we're doing right NoWorkResult, and you can put this contstraint in the applicaiton level or in the database level

And If you ever see data that is negative, that is indication of an inconsistent data, and now I'm mentioning a few things over the opera properties as you notice right, as we discussed the transaction

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