9.13. 文字檢索函式及運算子
Last updated
Last updated
Table 9.40,Table 9.41andTable 9.42summarize the functions and operators that are provided for full text searching. SeeChapter 12for a detailed explanation ofPostgreSQL's text search facility.
Table 9.40. Text Search Operators
Thetsquery
containment operators consider only the lexemes listed in the two queries, ignoring the combining operators.
In addition to the operators shown in the table, the ordinary B-tree comparison operators (=
,<
, etc) are defined for typestsvector
andtsquery
. These are not very useful for text searching but allow, for example, unique indexes to be built on columns of these types.
Table 9.41. Text Search Functions
All the text search functions that accept an optionalregconfig
argument will use the configuration specified bydefault_text_search_configwhen that argument is omitted.
The functions inTable 9.42are listed separately because they are not usually used in everyday text searching operations. They are helpful for development and debugging of new text search configurations.
Table 9.42. Text Search Debugging Functions