Question

我想打印以下结果

Oceania        109189 
South America  147435 
Europe         175138 
Africa         274439 
Asia           693038

我的查询是

select co.Continent bb, round(avg(ci.Population)) as aa
from Country co
  FULL OUTER JOIN City ci ON co.Code = ci.CountryCode
group by co.Continent
having (count(ci.ID)<>0 and co.Continent is not null)
order by aa asc;

并显示以下结果

Africa         274439 
Asia           693038 
Europe         175138 
Oceania        109190 
South America  147435

如何使用舍入值????

订购结果

Answer 1

尝试以下，

select bb, round(aa) as aa from (
    select co.Continent bb, avg(ci.Population) as aa
    from Country co
    FULL OUTER JOIN City ci ON co.Code = ci.CountryCode
    group by co.Continent
    having (count(ci.ID)<>0 and co.Continent is not null)
)T
order by round(aa);

Answer 2

我认为没有理由为什么ORDER BY不起作用。您的查询是正确的。显然，你得到了co.Continent订购的唱片。

因此，在从DBMS获取结果后，您的应用必须执行此类操作。可能是自动排序列表框等吗？

Answer 3

这不是简单的工作吗？：

  select co.continent bb, round (avg (ci.population)) as aa
    from country co full outer join city ci on co.code = ci.countrycode
group by co.continent
  having (count (ci.id) <> 0 and co.continent is not null)
order by round (avg (ci.population)) asc;

使用圆柱排序

3 个答案: