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