Database: wedding
Question: Show the church names for the weddings of all people older than 30.
SQL: select t4.name from wedding as t1 join people as t2 on t1.male_id  =  t2.people_id join people as t3 on t1.female_id  =  t3.people_id join church as t4 on t4.church_id  =  t1.church_id where t2.age  >  30 or t3.age  >  30