删除postgresql中没有词干的停止词

Question

我想从我的数据中删除停用词,但我不想阻止这些词,因为确切的词对我很重要.我用过这个查询.

SELECT to_tsvector('english',colName)from tblName order by lower asc;

有没有什么方法可以删除stopWords而不会阻止词语？

谢谢

Answer 1

创建自己的文本搜索词典和配置:

CREATE TEXT SEARCH DICTIONARY simple_english
   (TEMPLATE = pg_catalog.simple, STOPWORDS = english);

CREATE TEXT SEARCH CONFIGURATION simple_english
   (copy = english);
ALTER TEXT SEARCH CONFIGURATION simple_english
   ALTER MAPPING FOR asciihword, asciiword, hword, hword_asciipart, hword_part, word
   WITH simple_english;

它的工作原理如下:

SELECT to_tsvector('simple_english', 'many an ox eats the houses');
???????????????????????????????????????
?             to_tsvector             ?
???????????????????????????????????????
? 'eats':4 'houses':5 'many':1 'ox':3 ?
???????????????????????????????????????
(1 row)

您可以将参数default_text_search_config设置simple_english为使其成为默认文本搜索配置.