The old table transition table holds the original state of the affected rows before they are processed by the UPDATE or DELETE statement.
OLDTABLE过渡表保存了受影响的行在被update或delete语句处理之前的初始状态。
All that DB2 does is to allow an UPDATE, DELETE, and INSERT to appear in the from clause of a select and allow the user to chose which transition table shall be selected from.
DB 2所做的就是允许UPDATE、DELETE和INSERT出现在选择语句的from子句中，并允许用户选择应该从哪个过渡表进行选择。
The transition so far: it was easy to set up, and I forwarded all incoming Gmail emails to Fastmail. Eventually I'll delete my Gmail, but for now I'll leave it.
转变：这很容易做到，我把我所有收到的邮件都转发到Fastmail里，最终我将要删除我的Gmail账号，但是现在我将要离开Fastmail。
The transition so far: it was easy to set up, and I forwarded all incoming Gmail emails to Fastmail. Eventually I'll delete my Gmail, but for now I'll leave it.
转变：这很容易做到，我把我所有收到的邮件都转发到Fastmail里，最终我将要删除我的Gmail账号，但是现在我将要离开Fastmail。
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