The Tsql2 Temporal Query Language

By: Tsql2 Language Design Committee, Richard T. Snodgrass (Editor)

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Hardcover | 31 August 1995

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Temporal databases have been an active research topic for at least fifteen years. During this time, several dozen temporal query languages have been proposed. Many within the temporal database research community perceived that the time had come to consolidate approaches to temporal data models and calculus based query languages, to achieve a consensus query language and associated data model upon which future research can be based. While there were many query language proposals, with a diversity of language and modeling constructs, common themes kept resurfacing. However, the community was quite frag mented, with each research project being based on a particular and different set of assumptions and approaches. Often these assumptions were not germane to the research per se, but were made simply because the research required a data model or query language with certain characteristics, with the partic ular one chosen rather arbitrarily. It would be better in such circumstances for research projects to choose the same language. Unfortunately, no existing language had attracted a following large enough to become the one of choice. In April, 1992 Richard Snodgrass circulated a white paper that proposed that a temporal extension to SQL be produced by the research community. Shortly thereafter, the temporal database community organized the "ARPA/NSF In ternational Workshop on an Infrastructure for Temporal Databases," which was held in Arlington, TX, in June, 1993.

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Non-Fiction Computing & I.T.Computer Programming & Software Development Database Programming Databases Computer Science Algorithms & Data Structures

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Published: 13th October 2012

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List of Figures
List of Tables
Preface
Rationale for a Temporal Extension to SQL	p. 3
Introduction to TSQL2	p. 19
TSQL2 Tutorial	p. 33
A Second Example	p. 49
The Baseline Clock	p. 77
The Data Model for Time	p. 97
Supporting Multiple Calendars	p. 103
Temporal Data Types	p. 123
The Surrogate Data Type	p. 153
The TSQL2 Data Model	p. 157
Schema Specification	p. 241
The From Clause	p. 245
Valid-Time Selection and Projection	p. 251
Modification	p. 299
Cursors	p. 305
Event Tables	p. 311
Transaction Time Support	p. 319
Temporal Indeterminacy	p. 327
Temporal Granularity	p. 347
"Now"	p. 385
Aggregates	p. 395
Schema Versioning	p. 427
Vacuuming	p. 451
An Architectural Framework	p. 465
A Timestamp Representation	p. 475
SQL-92 Compatibility Issues	p. 501
An Algebra for TSQL2	p. 505
Language Syntax	p. 549
Section 5 Lexical Elements	p. 551
Section 6 Scalar Expressions	p. 563
Section 7 Query Expressions	p. 591
Section 8 Predicates	p. 599
Section 10 Additional Common Elements	p. 605
Section 11 Schema Definition and Manipulation	p. 607
Section 12 Module	p. 617
Section 13 Data Manipulation	p. 621
Section 21 Information Schema and Definition Schema	p. 629
Section 22 Status Codes	p. 631
References	p. 633
Author Index	p. 651
Syntax Index	p. 657
Subject Index	p. 667
Table of Contents provided by Blackwell. All Rights Reserved.

The Tsql2 Temporal Query Language

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