Domain Independent Query

A query q is called domain independent if the value of q when applied to any database is the same for any two domains containing the database values or equivalently if the value of q when applied to a database contains only values that occur in the database.

Domain independent query. Query logs of a web search engine have been increasingly used as a vital source for data mining. Query logs of a web search engine have been increasingly used as a vital source for data mining. A brief explanation of clean architecture clean domain driven design and command query responsibility segregation.

The semantic equivalence between the natural language query and the sql statement we have tested iqc on the three database. Emp1 is an alies of outer query and it is being used in subquery. Hence any em domain independent query is continuous too.

Obviously all domain independent queries over databases without external functions are continuous since it suffices to take do to be the active domain which is finite. That is queries that may return different results for different domains are excluded. Domain independent relational calculus di relcalc relational calculus under active domain semantics relational algebra with the operations π σ ρ we won t give a formal proof of this statement which can be found in the book in.

The domain independent relational calculus queries are precisely those relational calculus queries that are invariant under choosing domains of values beyond those appearing in the database itself. A brief explanation of clean architecture clean domain driven design and command query responsibility segregation. If a subquery does use any refrence alies from outer query then it would be called as independent incorrelated subquery.

This paper presents a study on large scale domain independent entity extraction from search query logs we present a completely unsupervised method to extract entities by applying pattern based heuristics and statistical measures. Sorry we are unable to provide the full text but you may find it at the following location s. For comparison we have considered translation success i e.

Northwind geobase and supplier part database. Any sem domain independent query is continuous. The following query languages have the same expressivity.