CREATE TABLE church (Church_ID INT, Name TEXT, Organized_by TEXT, Open_Date INT, Continuation_of TEXT)
CREATE TABLE people (People_ID INT, Name TEXT, Country TEXT, Is_Male TEXT, Age INT)
CREATE TABLE wedding (Church_ID INT, Male_ID INT, Female_ID INT, Year INT)

A pie chart about the proportion of the number of countries for all people whose age is smaller than the average.
SELECT Country, COUNT(Country) FROM people WHERE Age < (SELECT AVG(Age) FROM people) GROUP BY Country
SELECT "Country", COUNT("Country") FROM "people" WHERE "Age" < (SELECT AVG("Age") FROM "people") GROUP BY "Country"