We propose simple,yet powerful, methods to generate SQL code to returnaggregated columns in a horizontal tabular layout, returning aset of numbers instead of one number per row. This new class offunctions is called horizontal aggregations. Horizontalaggregations build data sets with a horizontal ...
The Data Man- ager (DM) offers data management typical of a DBMS on a different networked con- text. Fig. 1. NPDM Modules Tuple Management: the NPDM implements parallel processing of tuples over the network. Nodes participating in the storage and processing of complex queries are expected ...
In these disclosures, an extension of the SQL syntax is proposed that allows more efficient processing to be done on a group-by-group basis. This makes the queries simpler and easier to handle in the optimizer. The SQL standard compliant window aggregate functions syntax already implemented in D...
preparation and integration. In particular, FRAQL offers the following features: transparent access to heterogeneous sources ranging from DBMS like Oracle to structured docu- ments like XML files, user-defined functions and aggregates, whereas Java and C++ are used as implementation lan- ...
Incremental Aggregation on Multiple Continuous Queries - Jin, Carbonell - 2006 () Citation Context ...y update are achieved by DBMS indexing techniques, and the compact storage is achieved by following the database design methodologies. We focus on select-join-project queries in this paper. ...
Incremental Aggregation on Multiple Continuous Queries - Jin, Carbonell - 2006 () Citation Context ...y update are achieved by DBMS indexing techniques, and the compact storage is achieved by following the database design methodologies. We focus on select-join-project queries in this paper. ...
The constraints and the objective function are specified in terms of aggregate functions of relational attributes, and the parameter values identify the constants used in the aggregation constraints. Results indicate that the methodology is effective and can be deployed easily, utilizing index structures ...
, extension to SQL standard aggregate functions to compute horizontal aggregations We propose two fundamental methods to evaluate horizontal aggregations: CASE: Exploiting the programming CASE construct; SPJ: Based on standard relational algebra operators (SPJ queries); which is offered by some DBMSs....
In addition the Ordered Weighted Aggregation (OWA) operators are adapted for aggregating the distance functions of these features. The system supports nearest neighbor queries and various types of fuzzy queries; feature-based, image-based and color-based queries. The experimental results show that our...
The methods based on the max(), min(), avg() functions have the highest data aggregation degree. Such methods aggregate n data packets into 1 data packet, which can be abstracted as a convergecast problem [41,58]. Convergecast are divided into two phases. In the first phase, what ...