Table schema:
CREATE TABLE countrylanguage (Language VARCHAR, CountryCode VARCHAR); CREATE TABLE country (Code VARCHAR, GovernmentForm VARCHAR)

Question: Which languages are spoken by only one country in republic governments?
SQL: SELECT T2.Language FROM country AS T1 JOIN countrylanguage AS T2 ON T1.Code = T2.CountryCode WHERE T1.GovernmentForm = "Republic" GROUP BY T2.Language HAVING COUNT(*) = 1