What is the zip code of the address where the teacher with first name "Lyla" lives?
SELECT T1.zip_postcode FROM Addresses AS T1 JOIN Teachers AS T2 ON T1.address_id  =  T2.address_id WHERE T2.first_name  =  "Lyla"
zip code of the address = zip_postcode; teacher with first name 'Lyla' refers to WHERE T2.first_name = 'Lyla';