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aggregate queries constrained

Foundations of Aggregation Constraints - Columbia CSbetween aggregation constraints over a non-empty, nite multiset of reals, and con-. straints on the elements of the multiset. We show how these relationships can be used. to push constraints through aggregate functions to enable compile-time optimization of. database queries involving aggregate functions and constraints.aggregate queries constrained,aggregate queries constrained,Foundations of Aggregation Constraints - CSE, IIT BombayAbstract. We introduce a new constraint domain, aggregation constraints, that is useful in database query languages, and in constraint logic programming languages that incor- porate aggregate functions. First, we formally study the fundamental problem of deter- mining if a conjunction of aggregation constraints is solvable,.

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Foundations of aggregation constraints - ScienceDirectFeb 28, 1998 . We introduce a new constraint domain, aggregation constraints, that is useful in database query languages, and in constraint logic programming languages that incorporate aggregate functions. We formally study the fundamental problem of determining if a conjunction of aggregation constraints is.aggregate queries constrained,Containment of Aggregate Queries - Semantic Scholaron aggregation [4, 16]. Aggregate queries have also been studied in a variety of settings beyond relational databases, such as mobile computing [1], global infor- mation systems [21], stream data analysis [12], sensor networks [22] and constraint databases [2]. The execution of aggregate queries tends to be time consuming.

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Exact and Approximate Aggregation in Constraint Query Languages

We investigate the problem of how to extend constraint query languages with aggregate operators. We deal with standard relational aggregation, and also with ag- gregates speci c to spatial data, such as volume. We study several approaches, including the addition of a new class of approximate aggregate operators which.

Containment of Aggregate Queries∗

on aggregation [4, 16]. Aggregate queries have also been studied in a variety of settings beyond relational databases, such as mobile computing [1], global infor- mation systems [21], stream data analysis [12], sensor networks [22] and constraint databases [2]. The execution of aggregate queries tends to be time consuming.

Aggregation | Django documentation | Django

When used with an aggregate() clause, a filter has the effect of constraining the objects over which the aggregate is calculated. For example, you can generate the average price of all books with a title that starts with “Django” using the query: >>> Book.objects.filter(name__startswith="Django").aggregate(Avg('price')).

SQL Aggregate Functions - ZenTut

In this tutorial, we will introduce you to the most commonly used SQL aggregate functions including MIN, MAX, SUM, AVG and COUNT functions.

Aggregate Pseudorandom Functions and Connections to Learning

one-way functions exist. We show AGG-PRFs under various cryptographic hardness assumptions (one-way functions and. DDH) for a number of types of aggregation operators such as sums and products and for a number of set systems including intervals, hypercubes, and (the supports of) restricted computational models.

Estimating Range Queries Using Aggregate Data with Integrity .

Estimating Range Queries Using Aggregate. Data with Integrity Constraints: A Probabilistic. Approach. Francesco Buccafurri1, Filippo Furfaro2, and Domenico Sacc`a3. 1 DIMET, University of Reggio Calabria, 89100 Reggio Calabria, Italy, buccaing.unirc. 2 DEIS, University of Calabria, 87030 Rende, Italy,.

SPARQL 1.1 Query Language - World Wide Web Consortium

Mar 21, 2013 . SPARQL contains capabilities for querying required and optional graph patterns along with their conjunctions and disjunctions. SPARQL also supports aggregation, subqueries, negation, creating values by expressions, extensible value testing, and constraining queries by source RDF graph. The results of.

SQL: Queries, Constraints, Triggers Part 2 - UNC Computational .

SQL's Aggregate Operators. ❖ Significant extension of relational algebra. ❖ Computation and summarization operations. ❖ Appears in target-list of query. ❖ Results aggregate rather than appear individually. ❖ E.x. How many instances in the sailor relation? COUNT (*). COUNT ( [DISTINCT] A). SUM ( [DISTINCT] A).

BlinkDB: Queries with Bounded Errors and Bounded Response .

The current version of BlinkDB supports a slightly constrained set of SQL-style declarative queries and provides approximate results for standard SQL aggregate queries, specifically queries involving COUNT, AVG, SUM and PERCENTILE and is being extended to support any User-Defined Functions (UDFs). Queries.

aggregate queries constrained,

Aggregation in Constraint Databases 1.1 Abstract 1.2 Introduction

Aggregation in Constraint Databases. Gabriel M. Kuper. 1.1 Abstract. We show how to add aggregation to a constraint database query lan-. guage. One example of the use of aggregation in such a database is. computing the area of a region in a geographic database. We show how. aggregation can be added to the algebra.

Foundations of Aggregation Constraints - ResearchGate

Abstract. We introduce a new constraint domain, aggregation constraints, that is useful in database query languages, and in constraint logic programming languages that incorpo- rate aggregate functions. We formally study the fundamental problem of determining if a conjunction of aggregation constraints is satis able, and.

Extending Network Lifetime for Precision-Constrained Data . - NTU

The designated precision of aggregate data must be guaranteed provided that each sensor node updates the readings with the base station according to its allocated error bound. Therefore, the error bounds allocated to individual sensor nodes have to satisfy certain feasibility constraints. Different aggregation functions.

aggregate queries constrained,

SPARQL 1.1 Query Language - World Wide Web Consortium

Mar 21, 2013 . SPARQL contains capabilities for querying required and optional graph patterns along with their conjunctions and disjunctions. SPARQL also supports aggregation, subqueries, negation, creating values by expressions, extensible value testing, and constraining queries by source RDF graph. The results of.

An OLAP System for Network-Constrained Moving Objects - UVSQ

to optimize spatiotemporal aggregate queries for network- constrained MOs. The rest of this paper is organized as follows. Section 2 presents the underlying spatiotemporal model; Section 3 introduces our multidimensional data model and data structure. Section 4 proposes a novel spatiotemporal index and describes an.

SQL: Queries, Constraints, Triggers Part 2 - UNC Computational .

SQL's Aggregate Operators. ❖ Significant extension of relational algebra. ❖ Computation and summarization operations. ❖ Appears in target-list of query. ❖ Results aggregate rather than appear individually. ❖ E.x. How many instances in the sailor relation? COUNT (*). COUNT ( [DISTINCT] A). SUM ( [DISTINCT] A).

Processing Complex Aggregate Queries over Data Streams

Two key parameters for query processing over continuous data- streams are (1) the amount of memory made available to the on- line algorithm, and (2) the per-item processing time required by the query processor. The former constitutes an important constraint on the design of stream processing algorithms, since in a.

aggregate queries constrained,

Range-Aggregate Queries Involving Geometric . - users.cs.umn.edu

Range-aggregate version of point enclosure queries, 1-d segment intersection, 2-d orthogonal seg- ment intersection (with/without distance constraint) are revisited and we improve the existing results for these problems. We also provide semi- dynamic (insertions) solutions to some of these problems. This paper is the first.

Using and Configuring Query Features (REST Application .

For details, see Using a Query to Constrain Results. Specify the result content type (XML or JSON) using the format parameter or the HTTP Accept headers. The default content type is XML. For details, see Controlling Input and Output Content Type. If you only want the aggregate value in the results, set the view parameter to.

Overview: Level of Detail Expressions - Tableau Help

If you create a calculation with this definition, save it with the name [ProfitRatio], and then drag it from the Data pane to a shelf, Tableau typically aggregates the calculated field for the view: . For details, see Aggregate Functions in Tableau. . The following limitations and constraints apply for level of detail expressions.

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