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Determining the answers to a query on a database
In database theory, the query evaluation problem is the problem of determining the answers to a query on a database. Research in database theory aims
Query_evaluation
Finding information for an information need
information need can be specified in the form of a search query. In the case of document retrieval, queries can be based on full-text or other content-based indexing
Information_retrieval
SQL statement that returns a result set of rows from one or more tables
language, SELECT queries specify a result set, but do not specify how to calculate it. The database translates the query into a "query plan" which may
Select_(SQL)
Statistics about search result quality
established a number of key aspects required for IR evaluation: a test collection, a set of queries and a set of pre-determined relevant items which combined
Evaluation measures (information retrieval)
Evaluation_measures_(information_retrieval)
Declarative logic programming language
top-down evaluation model. This difference yields significantly different behavior and properties from Prolog. It is often used as a query language for
Datalog
Type of database query
theory, a conjunctive query is a restricted form of first-order queries using the logical conjunction operator. Many first-order queries can be written as
Conjunctive_query
Since the homomorphism problem is equivalent to conjunctive query evaluation and conjunctive query containment, these two problems are equivalent to constraint
Complexity of constraint satisfaction
Complexity_of_constraint_satisfaction
Use of machine learning to rank items
the above evaluation measures, averaged over all queries in the training data. This is often difficult in practice because most evaluation measures are
Learning_to_rank
ETL tool developed by Microsoft
Power Query is an ETL tool created by Microsoft for data extraction, loading and transformation, and is used to retrieve data from sources, process it
Power_Query
American database company
shared-nothing nodes using a query to data approach. Here nodes typically own a subset of the data. SQL queries are split into query fragments and sent to the
Clustrix
Query language for property graphs
GQL (Graph Query Language) is a standardized query language for property graphs first described in ISO/IEC 39075, released in April 2024 by ISO/IEC. The
Graph_Query_Language
Programming paradigm focused on difficult search problems
DPLL algorithm and, in principle, it always terminates (unlike Prolog query evaluation, which may lead to an infinite loop). In a more general sense, ASP
Answer_set_programming
Text query method in information retrieval
particularly in the context of query understanding. In the context of search engines, query expansion involves evaluating a user's input (what words were
Query_expansion
Java library for full-text search
to Block-Max Wand: The Story of How Lucene Significantly Improved Query Evaluation Performance", in Jose, Joemon M.; Yilmaz, Emine; Magalhães, João; Castells
Apache_Lucene
Sequence of steps used to access data in a SQL relational database management system
to execute a given query, with widely varying performance. When a query is submitted to the database, the query optimizer evaluates some of the different
Query_plan
Programming language that uses first order logic
encountered in a query evaluation are maintained in a table, along with answers to these subgoals. If a subgoal is re-encountered, the evaluation reuses information
Prolog
System that provides database services specifically for arrays
the query does not enforce any explicit iteration sequence over the array cells during evaluation. Evaluation safety is achieved when every query terminates
Array_DBMS
Danish computer scientist
IT University of Copenhagen. In 2007, Rasmus founded the Scalable Query Evaluation for Reliable Databases (SQERD) project. The project aimed at applying
Rasmus_Pagh
Proving validity without revealing other data
18, 2026. Li, X.; others (2023). "ZKSQL: Verifiable and Efficient Query Evaluation with Zero-Knowledge Proofs" (PDF). Proceedings of the VLDB Endowment
Zero-knowledge_proof
Search engine processing step
Query understanding is the process of inferring the intent of a search engine user by extracting semantic meaning from the searcher’s keywords. Query
Query_understanding
Relational database programming language
Structured Query Language (SQL) (pronounced /ˌɛsˌkjuˈɛl/ S-Q-L; or alternatively as /ˈsiːkwəl/ "sequel") is a domain-specific language used to manage
SQL
Query returning true/false based on whether a conjunction of conditions holds
relational databases, a Boolean conjunctive query is a conjunctive query without distinguished predicates, i.e., a query in the form R 1 ( t 1 ) ∧ ⋯ ∧ R n ( t
Boolean_conjunctive_query
Measure of ranking quality
information retrieval. It is often normalized so that it is comparable across queries, giving Normalized DCG (nDCG or NDCG). NDCG is often used to measure effectiveness
Discounted_cumulative_gain
Characterizing and appraising something
period of time. Evaluation is commonly used to refer specifically to program evaluation or policy evaluation, which involves evaluating social policy and
Evaluation
Extension of SQL
proposed for query evaluation, the most important being the one based on the derivation principle. This consists in deriving classic queries that produce
SQLf
Theory of economic choice
subsequent work has extended query theory to intertemporal choice, preference construction in groups, and its relationships to evaluation of sequences and consumer
Query_theory
Typographic character indicating a question (?)
The question mark ? (also known as interrogation point, query, or eroteme in journalism) is a punctuation mark that indicates a question or interrogative
Question_mark
Computer bug exploit caused by invalid data
text as code. Injection flaws are often found in services like Structured Query Language (SQL) databases, Extensible Markup Language (XML) parsers, operating
Code_injection
RDF query language
recursive acronym for SPARQL Protocol and RDF Query Language) is an RDF query language—that is, a semantic query language for databases—able to retrieve and
SPARQL
Israeli computer scientist (born 1955)
David; Herscovici, Michael; Soffer, Aya; Zien, Jason (2003). "Efficient query evaluation using a two-level retrieval process" (PDF). Proceedings of the twelfth
David_Carmel
Computational strategy for large datasets
implementations span various fields and applications, from database indexing/query processing, and information retrieval to machine learning and big data analytics
Filter_and_refine
Index of articles associated with the same name
database theory, the complexity of evaluating a query on a database when measured as a function of the query size Query (complexity), a mapping between logical
Query_complexity
Database using graph structures for queries
graph database (GDB) is a database that uses graph structures for semantic queries with nodes, edges, and properties to represent and store data. A key concept
Graph_database
Feature to efficiently execute queries efficiently in DBMS softwares
execute a given query by considering the possible query plans. Generally, the query optimizer cannot be accessed directly by users: once queries are submitted
Query_optimization
Computer hacking technique
forces the database to evaluate a logical statement on an ordinary application screen. As an example, a book review website uses a query string to determine
SQL_injection
Microsoft .NET Framework component
Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET framework component that adds native data querying abilities to .NET languages
Language_Integrated_Query
databases and specifically in graph databases, a regular path query or RPQ is a query asking for pairs of endpoints in the database that are connected
Regular_path_query
Automated information retrieval method
provided in a search query. In other words, the ideas expressed in the information retrieved in response to a concept search query are relevant to the
Concept_search
Android c++ language
retrieval system has two main tasks: Find relevant documents to user queries Evaluate the matching results and sort them according to relevance, using algorithms
Document_retrieval
Algorithm for modelling sequential data
q_{i}=x_{i,{\text{query}}}W^{Q}} . The matrix of all query vectors is the query matrix: Q = X query W Q {\displaystyle Q=X_{\text{query}}W^{Q}} Similarly
Transformer_(deep_learning)
Data structure for storing integers from a bounded domain
2011-04-13. Kementsietsidis, Anastasios; Wang, Min (2009), Provenance Query Evaluation: What's so special about it?, Proceedings of the 18th ACM conference
X-fast_trie
outgrowth of relational query optimization, where query evaluation programs were defined as relational algebra expressions, and query optimization was expression
Feature-oriented_programming
Statistical measure of a test's accuracy
Porta Mana P (May 2022). "Does the evaluation stand up to evaluation? A first-principle approach to the evaluation of classifiers". arXiv:2302.12006 [cs
F-score
Organized collection of data in computing
especially in a data warehouse system. Query optimizer – Performs query optimization on every query to choose an efficient query plan (a partial order (tree) of
Database
American computer scientist and writer (born 1955)
best known for his work on temporal databases, query language design, query optimization and evaluation, storage structures, database design, and ergalics
Richard_T._Snodgrass
Dan; Olteanu, Dan; Ré, Christopher; Koch, Christoph (2011), "The Query Evaluation Problem", in Suciu, Dan; Olteanu, Dan; Ré, Christopher; Koch, Christoph
♯SAT
Austrian computer scientist
Koch, C.; Pichler, R.; Segoufin, L. (2005). "The complexity of XPath query evaluation and XML typing". Journal of the ACM. 52 (2): 284. CiteSeerX 10.1.1
Georg_Gottlob
Set of questions in relational database theory
relational tables) to an output table, which is the main focus of standard query evaluation, reverse data management reverses that focus and studies the possible
Reverse_data_management
Representation in natural language processing
Multilingual and Crosslingual Focused Evaluation". Proceedings of the 11th International Workshop on Semantic Evaluation (SemEval-2017). Vancouver, Canada:
Sentence_embedding
algorithm in database theory for evaluating acyclic join queries (more generally, (alpha-)acyclic conjunctive queries, see GYO algorithm). It first uses
Yannakakis_algorithm
Resource Description Framework query language, a W3C recommendation
An RDF query language is a computer language, specifically a query language for databases, able to retrieve and manipulate data stored in Resource Description
RDF_query_language
Measure of search traffic an information retrieval system receives
Queries per second (QPS) is a measure of the amount of search traffic an information-retrieval system, such as a search engine or a database, receives
Queries_per_second
Display of results from a search
to a query by a user. The main component of a SERP is the listing of results that are returned by the search engine in response to a keyword query. The
Search_engine_results_page
Search quality measure in information retrieval
rank is a statistic measure for evaluating any process that produces a list of possible responses to a sample of queries, ordered by probability of correctness
Mean_reciprocal_rank
Computer query in SQL
a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values
Correlated_subquery
Type of information retrieval using LLMs
LLMs first refer to a specified set of documents, then respond to user queries. These documents supplement information from the LLM's pre-existing training
Retrieval-augmented generation
Retrieval-augmented_generation
Optimization problem in computer science
distance specified in the query, neighboring branches that might contain hits may also need to be evaluated. For constant dimension query time, average complexity
Nearest_neighbor_search
Sorting method in information retrieval
of query is one of the fundamental problems in information retrieval (IR), the scientific/engineering discipline behind search engines. Given a query q
Ranking (information retrieval)
Ranking_(information_retrieval)
List of probabilistic data structures for databases
Matching. University of Toronto. Nilesh N. Dalvi, Dan Suciu: Efficient query evaluation on probabilistic databases. VLDB J. 16(4): 523–544 (2007) Lyublena
Probabilistic_database
Database class for storage and retrieval of modeled data
topologies, etc. Graph databases and their query language The performance of NoSQL databases is usually evaluated using the metric of throughput, which is
NoSQL
information retrieval tasks. IR (information retrieval) evaluation begins whenever a user submits a query (search term) to a database. If the user is able to
Universal_IR_Evaluation
Functional data processing and query language
BigData query languages like PIG Latin and Hive QL illustrates performance and usability aspects of these technologies. Jaql supports lazy evaluation, so
Jaql
Condition in databases
predicate) in a query is said to be sargable if the DBMS engine can take advantage of an index to speed up the execution of the query. The term is derived
Sargable
Relational database management system, first implementation of SQL
implementation of SQL, which has since become the standard relational data query language. It was also the first system to demonstrate that a relational
IBM_System_R
Information retrieval involving digital images
may provide query terms such as keyword, image file/link, or click on some image, and the system will return images "similar" to the query. The similarity
Image_retrieval
SPARQL engine
Elvesæter, Brian; Martin-Recuerda, Francisco (2023). Evaluation of a Representative Selection of SPARQL Query Engines Using Wikidata (PDF). Extended Semantic
QLever
Object-oriented query language
object-oriented query language used to retrieve data from relational database management systems. It is reminiscent of the standard query language SQL and
.QL
Computing language
foundation enable Gremlin to naturally support imperative and declarative querying, host language agnosticism, user-defined domain specific languages, an
Gremlin_(query_language)
In databases, cached query results
a materialized view is a database object that contains the results of a query. For example, it may be a local copy of data located remotely, or may be
Materialized_view
monotonic query is one that does not lose any tuples it previously made output, with the addition of new tuples in the database. Formally, a query q over
Monotonic_query
Online information retrieval tool
own results. Metasearch engines take input from a user and immediately query search engines for results. Sufficient data is gathered, ranked, and presented
Metasearch_engine
Method of image retrieval
Content-based image retrieval, also known as query by image content (QBIC) and content-based visual information retrieval (CBVIR), is the application
Content-based_image_retrieval
Unsolved problem on graph query complexity
g ( n ) ) {\displaystyle \Omega (g(n))} . The deterministic query complexity of evaluating a function on n {\displaystyle n} bits (where the bits may be
Aanderaa–Karp–Rosenberg conjecture
Aanderaa–Karp–Rosenberg_conjecture
Database access software
SQL/DS (Structured Query Language/Data System), released in 1981, was IBM's first commercial relational-database management system. It implemented the
IBM_SQL/DS
Meetings for information retrieval research
large-scale evaluation of text retrieval methodologies and to increase the speed of lab-to-product transfer of technology. TREC's evaluation protocols have
Text_Retrieval_Conference
Data warehousing schema
case of the snowflake schema, and is more effective for handling simpler queries. The star schema gets its name from the physical model's resemblance to
Star_schema
Type of machine learning model
work has extended evaluation to multi-turn benchmarks and proposed interventions such as synthetic-data finetuning, adversarial evaluation, targeted preference-model
Large_language_model
Problem in computer science
exponential number of queries. This problem yields an oracle separation between the complexity classes BPP (bounded-error classical query complexity) and BQP
Simon's_problem
Real-time observability platform
On Linux, Netdata queries systemd journal files directly; on Windows, it uses native Windows Event Log APIs with a unified query interface. Since its
Netdata
American-Japanese thoroughbred racehorse
April 2002. Retrieved 21 February 2026. "Agnes Digital Offspring". PedigreeQuery. Archived from the original on 18 August 2019. Retrieved 6 August 2019.
Agnes_Digital
Software library for data analysis
lazy evaluation (where a query optimizer will use the most efficient evaluation after looking at all steps) compared with pandas using eager evaluation (where
Polars_(software)
Type of error-correcting code
through the point of interest x {\displaystyle x} . It then queries the codeword for the evaluation of the polynomial on points in S {\displaystyle S} and
Locally_decodable_code
Family of database software by Microsoft
relational database management system developed by Microsoft using Structured Query Language (SQL, often pronounced "sequel"). As a database server, it is a
Microsoft_SQL_Server
Functional programming and query language for XML
XQuery (XML Query) is a query language and functional programming language designed to query and transform collections of structured and unstructured data
XQuery
Set of rules defining correctly structured Prolog programs
following query being evaluated as true: ?- sibling(sally, erica). Yes This is obtained as follows: Initially, the only matching clause-head for the query sibling(sally
Prolog_syntax_and_semantics
Marker used in SQL databases to indicate a value does not exist
In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by
Null_(SQL)
A user's goal in making a search query
User intent, also known as query intent or search intent, is the identification and categorization of what a user online intended or wanted to find when
User_intent
Computing the fixed point of a function
{\displaystyle f} is accessible via evaluation queries: for any x {\displaystyle x} , the algorithm can evaluate f ( x ) {\displaystyle f(x)} . The run-time
Fixed-point_computation
Simple email-validation system designed to detect email spoofing
maximum of ten mechanisms querying DNS, i.e. any mechanism except from IP4, IP6, and ALL. Implementations can abort the evaluation with result TEMPERROR when
Sender_Policy_Framework
Type of fair division
terms of the Robertson–Webb query model, i.e., they relate to procedures asking the agents two types of queries: "Evaluate" and "Mark". Every deterministic
Proportional_cake-cutting
Research organisation in music data
business and marketing The Music Information Retrieval Evaluation eXchange (MIREX) is an annual evaluation campaign for MIR algorithms, coupled to the ISMIR
International Society for Music Information Retrieval
International_Society_for_Music_Information_Retrieval
interaction, rather than to a single query response. Other HCIR research, such as Pia Borlund's IIR evaluation model, applies a methodology more reminiscent
Human–computer information retrieval
Human–computer_information_retrieval
Computer vision test
a stochastic sequence of binary questions from a given test image”. The query engine produces a sequence of questions that have unpredictable answers
Visual_Turing_Test
data on the space environment in order to perform analyses and queries needed for evaluation of space environment hazards. The development was performed
SEDAT
Language for geospatial coverage data
The Web Coverage Processing Service (WCPS) is a query language for filtering and processing of multi-dimensional raster coverages (grid-based digital
Web Coverage Processing Service
Web_Coverage_Processing_Service
Theory of relational databases
a theory that uses algebraic structures for modeling data and defining queries on it with well founded semantics. The theory was introduced by Edgar F
Relational_algebra
AN/FYA-4 consoles for printing reports). Query Language (473L Query) Query Language was "very similar to the COLINGO query language and was "a constrained English
IBM 473L Command and Control System
IBM_473L_Command_and_Control_System
Database of data representing objects in geometric space
represents objects defined in a geometric space, along with tools for querying and analyzing such data. Most spatial databases allow the representation
Spatial_database
Topics referred to by the same term
packets before its queue is full Abstract Query Model, a model for the structure and evaluation semantics of a query in JCR according to JSR-283; See Content
AQM
Protocol to run DNS queries over HTTPS
the DNS over TLS (DoT) protocol, a similar standard for encrypting DNS queries, differing only in the methods used for encryption and delivery. Based
DNS_over_HTTPS
QUERY EVALUATION
QUERY EVALUATION
Girl/Female
Gujarati, Indian, Kannada
Njn
Surname or Lastname
English, Scottish, and French
English, Scottish, and French : status name for a young servant,
Middle English and Old French page (from Italian paggio,
ultimately from Greek paidion, diminutive of pais ‘boy’,
‘child’). The surname is also common in Ireland (especially Ulster and
eastern Galway), having been established there since the 16th century.North German : metonymic occupational name for
a horse dealer, from Middle Low German page ‘horse’.(Pagé) : North American form of French Paget.A Pagé, also known as Carsy, Quercy, and
QUERY EVALUATION
QUERY EVALUATION
Boy/Male
Indian, Sanskrit
The Primeval God
Boy/Male
Arabic, Hindu, Indian, Muslim
Knowledge; Thousand; The Only One; One of Allah Names
Boy/Male
Muslim/Islamic
Coloured animal huge flood, dyer
Boy/Male
Australian, Danish, Latin, Russian
Greatest
Boy/Male
Tamil
Carried by the mind
Boy/Male
Muslim
Correct, Accurate
Boy/Male
Finnish, German, Swedish
Rejoice
Girl/Female
Hindu, Indian
Lover; Dusky
Boy/Male
Sikh
Desire
Girl/Female
Afghan, Arabic, Indian, Muslim, Sindhi
Captivating; Alluring; Enchanting; Intelligent
QUERY EVALUATION
QUERY EVALUATION
QUERY EVALUATION
QUERY EVALUATION
QUERY EVALUATION
imp. & p. p.
of Query
n.
A question; an inquiry to be answered or solved.
n.
A question in the mind; a doubt; as, I have a query about his sincerity.
v. t.
Earnest inquiry; question; query.
n.
That which is asked; inquiry; interrogatory; query.
v. t.
To twirl; to turn or wind round; to coil; as, to querl a cord, thread, or rope.
v. i.
To have a doubt; as, I query if he is right.
v. t.
To doubt of; to regard with incredulity.
v. t.
To doubt of; to be uncertain of; to query.
v. i.
To ask questions; to make inquiry.
v. t.
To address questions to; to examine by questions.
v. t.
To write " query" (qu., qy., or ?) against, as a doubtful spelling, or sense, in a proof. See Quaere.
p. pr. & vb. n.
of Query
pl.
of Query
n. & v.
See Querl.
n.
An interrogation point [?] as the sign of a question or a doubt.
n.
A groom; an equerry.
n.
A hand mill. See Quern.
v. t.
To put questions about; to elicit by questioning; to inquire into; as, to query the items or the amount; to query the motive or the fact.
n.
A mill for grinding grain, the upper stone of which was turned by hand; -- used before the invention of windmills and watermills.