postgresql-sort array by words in each elements

问题:

There is string array

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

Now i want to sort this array on count of words in each element. I have tried but cannot get any success.

I want this output

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

How i can do this?

回答1:

This does feel rather clumsy, but I can't think of a simpler solution right now:

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; 

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