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The query containment problem for conjunctive queries is also equivalent to the constraint satisfaction problem. [7] An important class of conjunctive queries that have polynomial-time combined complexity are the acyclic conjunctive queries. [8] The query evaluation, and thus query containment, is LOGCFL-complete and thus in polynomial time. [9]
A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.
A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information. [1] A well known example is the Structured Query Language (SQL).
An example of a monotonic query is a select-project-join query containing only conditions of equality (also known as conjunctive queries). Examples of non-monotonic queries are aggregation queries, or queries with set difference. Identifying whether a query is monotonic can be crucial for query optimization, especially in view maintenance and ...
For example, a search could be used to find "red brick house", and match phrases such as "red house of brick" or "house made of red brick". By limiting the proximity, these phrases can be matched while avoiding documents where the words are scattered or spread across a page or in unrelated articles in an anthology.
Apple agreed to pay $95 million in cash to settle a proposed class action lawsuit claiming that its voice-activated Siri assistant violated users' privacy. A preliminary settlement was filed on ...
Much of the UK is being hit with cold weather. Here are some tips for coping with low temperatures. LIVE: New weather warnings issued as snow and ice disrupt UK travel
The meanings of queries may also evolve over time. Therefore, the old labeled training queries may be out-of-data and useless soon. How to make the classifier adaptive over time becomes a big issue. For example, the word "Barcelona" has a new meaning of the new micro-processor of AMD, while it refers to a city or football club before 2007. The ...