Relational Databases for Biologists Tutorial – ISMB02 pdf

... 10 Tutorial Overview • Introduction to Relational Databases • Relational Database Fundamentals • Designing Relational Databases • Using Relational Databases Relational Database Fundamentals Relational ... (columns) – FROM [relation] – WHERE [condition] – JOIN - NATURAL, INNER, OUTER • Other SQL functions – COUNT() – MAX(), MIN(), AVE() – DISTINCT...

Ngày tải lên: 23/03/2014, 16:21

... 2010 Student Research Workshop, pages 7–1 2, Uppsala, Sweden, 13 July 2010. c 2010 Association for Computational Linguistics Towards Relational POMDPs for Adaptive Dialogue Management Pierre ... function, defined as R : S × A → , R(s, a) encodes the utility for the agent to perform the action a while in state s. It is therefore a model for the goals or preferences of the agent. A...

Ngày tải lên: 20/02/2014, 04:20

... in-line notation for single asserted Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00006-6 Copyright # 2010 Elsevier Inc. All rights of reproduction in any form reserved. 119 version ... specified on the transaction. For example, an insert of policy P861, effective for all of 2010, will not be rejected because the Policy table already shows that policy effect...

Ngày tải lên: 24/12/2013, 02:16

... before, throughout this book we are using a clock that ticks once a month. The graphic for row 6 only extends up to December 2010 because the delete transaction sets the effective end date for ... queryable data. Next, Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00025-X Copyright # 2010 Elsevier Inc. All rights of reproduction in any form reserved. 161 within...

Ngày tải lên: 21/01/2014, 08:20

... versions. 1 “{lengthen forwards}” is a two-word temporal extent state transformation name that, for the sake of readability, often needs a pronoun or a noun in the middle. For example, “{lengthen it forwards}” ... “{lengthen an episode forwards}”. In any of these alternative forms, however, it is still the {lengthen forwards} transformation that is being referred to. The same is true for...

Ngày tải lên: 21/01/2014, 08:20

... {shorten forwards} transformation on that episode. [Finishes –1 ]. If a temporal delete transaction’s effective time ends on the same clock tick as that of an episode, but begins before that ... they must con- form. Conventional referential integrity (RI), at the level of types rather than instances, is a relationship between two relational Managing Time in Relational Databases. Doi:...

Ngày tải lên: 21/01/2014, 08:20

... immediately available for business use. Usually, IT technical personne l must do some work on these physical files or tables before a business user can query them for information. This takes ... lost. For example, data can be accidentally deleted before any copies are made. For datasets in the inflow pipelines, and which have not yet made it into the da tabase itself, the only recours...

Ngày tải lên: 21/01/2014, 08:20

... sequence of columns for this index, given that most queries will be looking for the one current row for an object, lost in a forest of non- current assertions and/or non-current versions for that same object? In ... be added to other search and foreign key indexes to help improve performance for current data. For example, a specialized index could be created to optimize searches...

Ngày tải lên: 26/01/2014, 08:20

... effective time which is either [before] or [before- 1 ] all other representations of the same object. Components: Allen relationship [before], Allen relationship [before À1 ], episode, effective ... exist in a “temporal sandbox” within a production table. They can be used for forecasting, for “what if” analyses, or for building up or otherwise working on one or more assertions until tho...

Ngày tải lên: 26/01/2014, 08:20

... Design for Relational Databases - 105 the unordered scan.3 Similar considerations can be applied for DELETE and INSERT statements. The reader is referred to [33] for details on the cost formulas. ... Design for Relational Databases l 107 Of the 20 columns in PARTS AND ORDERS, only 5 are plausible for statement (S3): PARTNO, WEIGHT, and QONHAND for PARTS, and PARTN...

Ngày tải lên: 20/02/2014, 05:21