SQLZOO(SUM and COUNT)Writeup
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转载自SQLZOO(SUM and COUNT)Writeup
1.
SELECT SUM(population)FROM world
2.
select DISTINCT(continent) from world
3.
select sum(gdp) from world where continent ='Africa'
4.
select count(name) from world where area>1000000
5.
select sum(population) from world where name in ('France','Germany','Spain')
6.
select continent,count(name) from world group by continent
7.
select continent,count(name) from world where population>= 10000000 group by continent
8.
select continent from world group by continent having sum(population)>=100000000
这里不能使用where语句,因为where语句不能与group by 一起使用。
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