SELECT avg(LifeExpectancy) FROM country WHERE Continent  =  "Africa" AND GovernmentForm  =  "Republic"
What is the average life expectancy in African countries that are republics?
SELECT avg ( LifeExpectancy ) FROM country WHERE Continent = `` Africa '' AND GovernmentForm = `` Republic ''
select avg ( lifeexpectancy ) from country where continent = value and governmentform = value
What is the average life expectancy in African countries that are republics ?