December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 12
Temporal Data Types in SQL
Abstract
SQL is the first programming language to have temporal data types in it. The problem is that our calendar system is irregular.
Keywords
Y2K problem
Common Era Calendar
ISO-8601
Universal Coordinated Time
YEAR
MONTH
DAY
HOUR
MINUTE
SECOND
Timestamp
Calendar date
Ordinal date
Week date
USNO
NIST
ITS
ACTS
Time zones
CURRENT_TIMESTAMP
LOCALTIMESTAMP
INTERVAL data types
Date arithmetic
OVERLAPS() predicate
History tables
State-transition constraints
Calendar tables
Report period tables
Clifford Simak wrote a science fiction novel entitled Time is the Simplest Thing in 1977. He was wrong. And the problems did not start with the Y2K problems we had in 2000, either. The calendar is irregular and the ...
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