我想从分区表中找出人口第二多的国家

如何解决我想从分区表中找出人口第二多的国家

我正在使用以下查询：

select country_name from (SELECT country_name,rank() OVER (ORDER BY TOTAL_pop desc) 
as rk FROM (SELECT country_name,sum(col8) as TOTAL_pop FROM world_bank_data_partitioned GROUP BY country_name)
) SUM_EMP where rk = 2;

并收到以下错误：

Error while compiling statement: Failed: ParseException line 1:197 cannot recognize input near ')' 'SUM_EMP' 'where' in subquery source

请帮助我。

解决方法

您可以使用以下 SQL。您需要为每个子查询设置别名。我将子查询命名为 rs。

select country_name from 
(SELECT country_name,rank() OVER (ORDER BY TOTAL_pop desc)  as rk FROM 
    (SELECT country_name,sum(col8) as TOTAL_pop FROM world_bank_data_partitioned GROUP BY country_name) rs 
) SUM_EMP where rk = 2;