Relational Databases for Biologists Tutorial – ISMB02 pdf
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...
Tài liệu Báo cáo khoa học: "Towards Relational POMDPs for Adaptive Dialogue Management" pdf
... 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...
Tài liệu Managing time in relational databases- P7 pdf
... 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...
Tài liệu Managing time in relational databases- P9 pdf
... 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...
Tài liệu Managing time in relational databases- P12 pdf
... 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...
Tài liệu Managing time in relational databases- P13 pdf
... {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:...
Tài liệu Managing time in relational databases- P16 pdf
... 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...
Tài liệu Managing time in relational databases- P19 pdf
... 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...
Tài liệu Managing time in relational databases- P23 pdf
... 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...
Tài liệu Physical Database Design for Relational Databases docx
... 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...
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