How about this:
select cd_area from area a1 where not exists ((select 1,2 union select 98,45 union select 11,0) except select
c2.cd_teacher,c2.cd_coursefrom teacher_course c2 where
c2.cd_course=a1.course)
?
Tom Lane wrote:
>Daniel Henrique Alves Lima <email_daniel_h@yahoo.com.br> writes:
>
>
>> I don't think this is possible, but: Is there a efficient way to
>>compare if the result of a query is a superset of the result of another ?
>>
>>
>
>Perhaps do "SELECT foo EXCEPT SELECT bar" and see if you get anything?
>
> regards, tom lane
>
>
>
