-- Database schema
| Allergy_Type : Allergy [ TEXT ] primary_key , AllergyType [ TEXT ] | Has_Allergy : StuID [ INT ] Has_Allergy.StuID = Student.StuID , Allergy [ TEXT ] Has_Allergy.Allergy = Allergy_Type.Allergy | Student : StuID [ INT ] primary_key , LName [ TEXT ] , Fname [ TEXT ] , Age [ INT ] , Sex [ TEXT ] , Major [ INT ] , Advisor [ INT ] , city_code [ TEXT ] |
-- -- Find the last name and age of the student who has allergy to both milk and cat.

SELECT lname ,  age FROM Student WHERE StuID IN (SELECT StuID FROM Has_allergy WHERE Allergy  =  "Milk" INTERSECT SELECT StuID FROM Has_allergy WHERE Allergy  =  "Cat");