> > > Why rollback.This is error (typing error).Nothing happen. > > > I think that we need clear set : what is start transaction ? > > > I think that transaction start with change data in database > > > (what don't change data this start not transaction. > > > > Another interesting case for a select is, what about > > select func(x) from table; > > Does func() have any side effects that might change data? > > At what point do we decide that the statement needs a > > transaction? > Function in select list mustn't change any data. > What if function change data in from clause ?
Why can't the function change data? I've done this one a number of times through views to log the user pulling out information from the system, and what it was at the time (time sensitive data). -- Rod Taylor ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
