Query evaluation information

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...

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...

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

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...

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...

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...

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

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...

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

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

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

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...

Structured Query Language (SQL) (pronounced S-Q-L; historically "sequel") is a domain-specific language used to manage data, especially in a relational...

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

Query complexity can refer to one of the following notions in computer science: Query complexity in database theory, the complexity of evaluating a query...

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...

that uses values from the outer query. Because the subquery may be evaluated once for each row processed by the outer query, it can be slow. Here is an example...

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

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

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...

considerations, including data modeling, efficient data representation and storage, query languages, security and privacy of sensitive data, and distributed computing...

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...

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

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...

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...