8. What is transaction?

Data Base에는 Transaction이란 개념이 있다. 여러개의 명령어를 하나로 모은 단위다.

BEGIN 키워드로 시작해서 Commit을 하면 Disk에 씌여진다. Transaction이 제대로 완료되지 않으면 ROLLBACK을 해야한다.

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