In database theory, the query evaluation problem is the problem[verification needed] of determining the answers to a query on a database. Research in database...

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...

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...

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...

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...

top-down evaluation model. This difference yields significantly different behavior and properties from Prolog. It is often used as a query language for...

Since the homomorphism problem is equivalent to conjunctive query evaluation and conjunctive query containment, these two problems are equivalent to constraint...

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...

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...

the above evaluation measures, averaged over all queries in the training data. This is often difficult in practice because most evaluation measures are...

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...

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...

particularly in the context of query understanding. In the context of search engines, query expansion involves evaluating a user's input (what words were...

proposed for query evaluation, the most important being the one based on the derivation principle. This consists in deriving classic queries that produce...

Structured Query Language (SQL) (pronounced /ˌɛsˌkjuˈɛl/ S-Q-L; or alternatively as /ˈsiːkwəl/ "sequel") is a domain-specific language used to manage...

to Block-Max Wand: The Story of How Lucene Significantly Improved Query Evaluation Performance", in Jose, Joemon M.; Yilmaz, Emine; Magalhães, João; Castells...

Query understanding is the process of inferring the intent of a search engine user by extracting semantic meaning from the searcher’s keywords. Query...

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...

the query does not enforce any explicit iteration sequence over the array cells during evaluation. Evaluation safety is achieved when every query terminates...

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...

is of value." From this perspective, evaluation "is a contested term", as "evaluators" use the term evaluation to describe an assessment, or investigation...

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...

Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages...

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...

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...

retrieval system has two main tasks: Find relevant documents to user queries Evaluate the matching results and sort them according to relevance, using algorithms...

execute a given query by considering the possible query plans. Generally, the query optimizer cannot be accessed directly by users: once queries are submitted...

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...

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...

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...