=?ISO-8859-2?Q?Miroslav_=A9imul=E8=EDk?= <simulcik(dot)miro(at)gmail(dot)com> writes:
> Is there any way how to force UPDATE to use default value of ID column from
> table a2 when updating rows in this table, without using triggers?
No. The update is expanded using the default expression applicable to
the table that is named in the update command (ie, the parent).
regards, tom lane