postgresql – Postgres中字符串的单词频率？

是否可以从Postgres中包含文本字符串的字段中识别每个字词和计数？

像这样的东西？

SELECT some_pk,regexp_split_to_table(some_column,'\s') as word
FROM some_table

获得不同的单词很容易：

SELECT disTINCT word
FROM ( 
  SELECT regexp_split_to_table(some_column,'\s') as word
  FROM some_table
) t

或得到每个单词的计数：

SELECT word,count(*)
FROM ( 
  SELECT regexp_split_to_table(some_column,'\s') as word
  FROM some_table
) t
GROUP BY word