Context: CREATE TABLE church (name VARCHAR); CREATE TABLE wedding (church_id VARCHAR, year VARCHAR); CREATE TABLE church (name VARCHAR, church_id VARCHAR)
Question: Show all church names except for those that had a wedding in year 2015.
Answer: SELECT name FROM church EXCEPT SELECT T1.name FROM church AS T1 JOIN wedding AS T2 ON T1.church_id = T2.church_id WHERE T2.year = 2015