"ed" <epdm...@gmail.com> wrote in message
news:d92e64410905221106t5c8b77eay9cbc5a4e3ccb8...@mail.gmail.com
> I guess i was assuming the command "create table x as select * from y"
> should preserve column constraints

Well, it can't, in general. Nothing says that a column in the newly 
created table must correspond to a column in existing table. Consider:

create table x as
select 1, a, b+1, c+d from y;

What constraints should be placed on the four columns of table x, and 
why?

Igor Tandetnik 



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