查询中我们可以使用最简单的SELECT * FROM table WHERE to_tsvector('parser_name', field) @@ 'word'来查询 field 字段分词中带有 word 一词的数据; 使用to_tsquery()方法将句子解析成各个词的组合向量,如国家大剧院的返回结果为'国家' & '大剧院' & '大剧' & '剧院',当然我们也可以使用& |符号拼接自...
1 mydb=# INSERT INTO test_tsvector (name,raw,vector) VALUES ('annie','loves dancing',to_tsvector('Loves Dancing')); mydb=# SELECT * FROM test_tsvector WHERE vector @@ to_tsquery('dancing'); name | raw | vector ---+---+--- mary | love dancing | 'danc':2 'love':1 annie ...
to_char(int, text) text 把整数转换成字串 to_char(125, '999') to_char(double precision, text) text 把实数/双精度数转换成字串 to_char(125.8::real, '999D9') to_char(numeric, text) text 把numeric转换成字串 to_char(-125.8, '999D99S') to_date(text, text) date 把字串转换成日期 ...
only builtin indexes and operators had dramatically different query plans when a policy is applied. In my case, the query `tsvector @@ tsquery` over a GIN index was no longer able to use that index. I was able to find one other instance [1] of someone being surprised by this behavior ...
cases (tsvector, etc) and that explanation is basically "this code follows what the corresponding custom typanalyze() function does". In the future, it may make sense to have custom typimport() functions for datatypes that have a custom typanalzye(), which would solve the issue of handling...
mydb=> SELECT to_tsquery( 'hello&cat' ); to_tsquery 一个全文检索示例如下,检索字符串是否包括hello和cat字符,本例中返回真。 mydb=> SELECT to_tsvector('english','Hello cat,how are u') @@ to_tsquery( 'hello&cat' ); 检索字符串是否包含字符hello和dog,本例中返回假。
PGSQL 之 array_to_string 函数:数组数据的 “贴心翻译官” 嘿呀,各位在 PGSQL 数据库这片奇幻森林中探险的数据探险家们!今天,我要给你们介绍一位超厉害的 “小伙伴”——array_to_string函数。这函数可不得了,它就像是数组数据的 “贴心翻译官”,专门负责把那些 “高冷” 又难懂的数组数据,翻译成大家都能...
PostgreSQL provides two data types that are designed to support full text search, which is the activity of searching through a collection of natural-language documents to locate those that best match a query. The tsvector type represents a document in a form optimized for text search; the tsquer...