SELECT SUM(population) FROM world
select distinct continent from world
select sum(gdp) from world
where continent = ‘Africa’
select count(distinct name) from world
where area >= 1000000
select sum(population) from world
where name in (‘Estonia’, ‘Latvia’, ‘Lithuania’)
select continent, count(distinct name) from world
group by continent
select continent, count(distinct name) from world
where population >= 10000000
group by continent
select continent from
(select continent, sum(population) as a from world
group by continent) c
where a >= 100000000