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_course from teacher_course c2 where c2.cd_course=a1.course)
?
Tom Lane wrote:
Daniel Henrique Alves Lima <[EMAIL PROTECTED]> 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
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