Question

我有一张桌子，国家：

loctn | area  | people
abc   | 12345 | 153465
cxv   | 43566 | 388573

我正在寻找选择查询的输出，例如：

select area, people from Country where loctn='abc' 

loctn | area | people
abc   | 123  | 153

Answer 1

根据您的评论，您实际上确实希望将其除以1000。您可以截断或获得下限值，因此它是一个整数-例如floor(area/1000)-然后根据需要连接固定的字符串值。

-- sample data as a CTE
with country (loctn, area, people) as (
  select 'abc', 12345, 153465 from dual
  union all select 'cxv', 43566, 388573 from dual
  union all select 'xyz', 134567 , 1234567  from dual
)
-- actual query
select loctn,
  floor(area/1000) || 'K+' as area,
  floor(people/1000) || 'K+' as people
from country;

LOCTN AREA       PEOPLE    
----- ---------- ----------
abc   12K+       153K+     
cxv   43K+       388K+     
xyz   134K+      1234K+

或对于单个值，例如您的问题中的查询：

select loctn,
  floor(area/1000) || 'K+' as area,
  floor(people/1000) || 'K+' as people
from country
where loctn = 'abc';

LOCTN AREA       PEOPLE    
----- ---------- ----------
abc   12K+       153K+

这与您在注释中描述的输出（我认为）相匹配，而不是与问题中显示的内容相匹配，但仍不清楚您真正想要的是什么。

Answer 2

面积和人数数字字段吗？

如果是，请尝试在下面查询。否则，从查询中删除to_char并运行。

select loctn,
       substr(to_char(area),1,3) as area,
       substr(to_char(people),1,3)  as people 
from Country

查询一列数字字段的前3位数字

2 个答案: