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The result displays text representing the time interval from date1 to date2 (date2 − date1). Dates are UTC—local times and time zones are not supported. Dates are checked for validity. For example, 29 February 2000 is accepted, but 29 February 1900 is not a valid date. Each date can include an era or a time, and a variety of formats are ...
DATE: for date values (e.g. 2011-05-03). TIME: for time values (e.g. 15:51:36). TIME WITH TIME ZONE: the same as TIME, but including details about the time zone in question. TIMESTAMP: This is a DATE and a TIME put together in one variable (e.g. 2011-05-03 15:51:36.123456). TIMESTAMP WITH TIME ZONE: the same as TIMESTAMP, but including details ...
Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment; ... File:SQL Dialects Reference.pdf. Add topic ...
Note (9): Despite the lack of a date datatype, SQLite does include date and time functions, [83] which work for timestamps between 24 November 4714 B.C. and 1 November 5352. Note (10): Informix DATETIME type has adjustable range from YEAR only through 1/10000th second.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
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The valid time and transaction time do not have to be the same for a single fact. For example, consider a temporal database storing data about the 18th century. The valid time of these facts is somewhere between 1701 and 1800. The transaction time would show when the facts were inserted into the database (for example 1998-01-21).
The term valid time was coined by Richard T. Snodgrass and his doctoral student (1986). [8]As of December 2011, ISO/IEC 9075, Database Language SQL:2011 Part 2: SQL/Foundation included clauses in table definitions to define "application-time period tables" (that is, valid-time tables).