Keyword query
A keyword query is a search request expressed primarily as words or terms that an information-retrieval system matches against indexed content.
Grokking Relational Database Design
Keyword searching is a query technique that finds records containing specified words or terms in text.
- How it is used
- Supports movie-title searches requiring keyword, partial-word, or fuzzy matching.
- How deep it goes
- Defines token-based full-text indexes, contrasts LIKE searches, and shows MySQL, MariaDB, and PostgreSQL implementations.
- Examples
- Uses movie titles, LIKE '%exciting%', and MATCH ... AGAINST('exciting' IN NATURAL LANGUAGE MODE).
- What you can do after
- Apply it via full-text indexes and database-specific search syntax for movie-title queries.
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MongoDB 8.0 in Action, Third Edition
A search query is an expression specifying terms, phrases, conditions, or patterns to match against indexed content.
- How it is used
- Supports full-text retrieval by matching keyword tokens against an Apache Lucene inverted index.
- How deep it goes
- Explains tokenization, lowercasing, inverted-index matching, relevance scoring, and logical operators.
- Examples
- Uses food-vendor, city, and street queries against two inspection documents.
- What you can do after
- Evaluate/understand how query terms retrieve documents and influence their relevance scores.
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Elasticsearch in Action, Second Edition
A search query is a request that evaluates query criteria against indexed documents to retrieve matching results.
- How it is used
- Retrieves indexed documents through the _search API using structured criteria or full-text matching.
- How deep it goes
- Explains analysis, token matching, relevance, and Boolean operators, but defers detailed precision and recall treatment.
- Examples
- Demonstrates a books index, a Java Complete Guide title search, highlighting, and explicit OR and AND operators.
- What you can do after
- Apply it via the Elasticsearch _search endpoint with Query DSL, choosing token matching and Boolean behavior for the search need.
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Related concepts
- percolate querycontrasts with · An Elasticsearch percolate query matches stored queries against a supplied document.
- logical AND operatorconfigured by · A logical AND operator is a Boolean conjunction that produces true exactly when all operands have true truth values.
- information retrievaladdressed by · Information retrieval is the process of finding and selecting items from a collection that are relevant to a query, task, or information need.
- similarity searchcontrasts with · Similarity search is a retrieval technique that finds or ranks items by comparing their representations with a query according to a similarity or distance measure.
- text analysisuses · Text analysis is the computational examination of textual content to extract information, identify patterns, or derive meaning.
- logical ORuses · Logical OR is a Boolean disjunction that evaluates to true when at least one operand or condition is true.
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