Question

有字符串数组

ARRAY['CAT','CAT DOG CAT','DOG Cat']

现在我想根据每个元素中的单词数对这个数组进行排序。我尝试过但无法取得任何成功。

我想要这个输出

ARRAY['CAT DOG CAT','DOG CAT','Cat']

我怎么能这样做？

Answer 1

这确实感觉相当笨拙，但我现在想不出更简单的解决方案：

with val (col) as (
  values (ARRAY['CAT','CAT DOG CAT','DOG Cat'])
), word_list as (
  select unnest(col) as pc
  from val
), wc as (
  select array_length(string_to_array(pc, ' '),1) as word_count, pc
  from word_list
)
select array_agg(pc order by word_count desc)
from wc;

Answer 2

我想出了一个替代方案：

select array_agg(a) 
from (
  select unnest(array['CAT','CAT DOG CAT','DOG Cat']) as a 
  order by a) s

postgresql-sort数组由每个元素中的单词组成

2 个答案: