Question: Show all church names that have hosted least two weddings.
Schema: create table wedding (church_id varchar, PRIMARY KEY (church_id)); create table church (name varchar, church_id varchar, PRIMARY KEY (name))
SQL: select t1.name from church as t1 join wedding as t2 on t1.church_id = t2.church_id group by t1.church_id having count(*) >= 2