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。

youdao

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。

youdao