关键词搜索

关键词搜索就是找到包含特定单词或短语的文档或记录，主要是基于搜索词和数据中的文本完全匹配。这和语义搜索不一样，语义搜索会理解查询背后的意思，即使文本里没有完全相同的词，也能提供上下文相关的结果。语义搜索会考虑同义词、意图和自然语言的细微差别，从而提供更细致的信息检索方式。

🌐 Keyword search involves locating documents or records that contain specific words or phrases, primarily based on the exact match between the search terms and the text within the data. It differs from semantic search, which interprets the meaning behind the query to provide results that are contextually related, even if the exact words aren't present in the text. Semantic search considers synonyms, intent, and natural language nuances to provide a more nuanced approach to information retrieval.

在 Postgres 中，关键字搜索是通过 全文搜索 实现的。它支持索引和文本分析用于数据检索，重点关注符合搜索条件的记录。Postgres 的全文搜索不仅限于关键字匹配，还能处理语言细微差别，非常适合需要精确文本查询的应用。

🌐 In Postgres, keyword search is implemented using full-text search. It supports indexing and text analysis for data retrieval, focusing on records that match the search criteria. Postgres' full-text search extends beyond keyword matching to address linguistic nuances, making it effective for applications that require precise text queries.

什么时候以及为什么使用关键词搜索 #

🌐 When and why to use keyword search

关键词搜索在需要精准和具体的情况下特别有用。当用户使用确切的术语或特定标识符查找信息时，它比语义搜索更有效。它确保结果直接包含这些词，减少检索到语义相关但用户不需要的信息的可能性。

🌐 Keyword search is particularly useful in scenarios where precision and specificity matter. It's more effective than semantic search when users are looking for information using exact terminology or specific identifiers. It ensures that results directly contain those terms, reducing the chance of retrieving irrelevant information that might be semantically related but not what the user seeks.

例如，在技术或学术研究数据库中，研究人员经常会搜索特定的研究、化合物或概念，这些都是通过某些术语或代码来识别的。使用化学化合物的准确分子式或唯一标识符进行搜索，会比语义搜索带来更集中、更相关的结果，而语义搜索可能返回讨论该化合物的各种文档。关键词搜索保证能找到明确提到确切术语的文档，让用户高效获取他们需要的精确数据。

🌐 For example in technical or academic research databases, researchers often search for specific studies, compounds, or concepts identified by certain terms or codes. Searching for a specific chemical compound using its exact molecular formula or a unique identifier will yield more focused and relevant results compared to a semantic search, which could return a wide range of documents discussing the compound in different contexts. Keyword search ensures documents that explicitly mention the exact term are found, allowing users to access the precise data they need efficiently.

也可以将关键词搜索与语义搜索结合起来，从而获取两者的优势。更多详情请参见混合搜索。

🌐 It's also possible to combine keyword search with semantic search to get the best of both worlds. See Hybrid search for more details.

使用全文搜索 #

🌐 Using full-text search

有关 Postgres 全文搜索的深入指南，包括如何存储、索引和查询记录，请参见 全文搜索。

🌐 For an in-depth guide to Postgres' full-text search, including how to store, index, and query records, see Full text search.

另请参阅 #

🌐 See also

• 语义搜索
• 混合搜索