[SQL] Help to simplify sample query

[Daniel Henrique Alves Lima]

   Hi guys, i have a new question about how to simplify a query. I have 
the tables area_course(cd_area,cd_course) and 
teacher_course(cd_teacher,cd_course) and a set of pairs of values 
{(1,2),(98,45),(11,0),...}.

   Now, i must to select the areas which courses appears in 
teacher_course and match with the set of pairs. Something like :

select cd_area from area a1 where
  exists (select * from teacher_course c2 where c2.cd_course = 
a1.cd_course and c2.cd_teacher = 1 and c2.cd_course = 2) and
  exists (select * from teacher_course c2 where c2.cd_course = 
a1.cd_course and c2.cd_teacher = 98 and c2.cd_course = 45) and
  exists (select * from teacher_course c2 where c2.cd_course = 
a1.cd_course and c2.cd_teacher = 11 and c2.cd_course = 0) and
....

   This is just a sample. The whole query is giant and its use other 
tables/columns. Is there a best way to write this query ?

   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 ?



   I would appreciate any ideas/suggestions. Thanks !!!



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