CREATE TABLE church (church_id DECIMAL, name TEXT, organized_by TEXT, open_date DECIMAL, continuation_of TEXT)
CREATE TABLE wedding (church_id DECIMAL, male_id DECIMAL, female_id DECIMAL, year DECIMAL)
CREATE TABLE people (people_id DECIMAL, name TEXT, country TEXT, is_male TEXT, age DECIMAL)

Show all church names except for those that had a wedding in year 2015.
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
SELECT "name" FROM "church" EXCEPT SELECT "T1"."name" FROM "church" AS "T1" JOIN "wedding" AS "T2" ON "T1"."church_id" = "T2"."church_id" AND "T2"."year" = 2015