sql - ORA-00933: SQL 命令未正确结束 ORACLE

Question

select  
  (
    (select Count(country_isoname) from games.country where country_olympic_code is null)
    /
    (select Count(*) from games.country)
  ) * 100 as 'Percentage'
from 
  games.country;

我目前正在尝试获取百分比但出现错误，我认为语法看起来正确吗？请帮忙！

Answer 1

'Percentage'是一个字符串文字。对象（列）名称用双引号括起来。

所以你需要使用"Percentage"not'Percentage'

Answer 2

尝试使用这个

select (t1.specific_count/t2.all_count)*100 from 
(select count(country_isoname) as specific_count from country    
where country_olympic_code is null) t1, 
(select count(*) as all_count from country) t2;