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The SQL function EXTRACT can be used for extracting a single field (seconds, for instance) of a datetime or interval value. The current system date / time of the database server can be called by using functions like CURRENT_DATE, CURRENT_TIMESTAMP, LOCALTIME, or LOCALTIMESTAMP.
The XFS filesystem, starting with Linux 5.10, has an optional "big timestamps" feature which extends the timestamp range to the year 2486. [27] While the native APIs of OpenVMS can support timestamps up to 31 July 31086, [28] the C runtime library (CRTL) uses 32-bit integers for time_t. [29]
A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. Timestamps do not have to be based on some absolute notion of time, however.
A substantive difference between the TSQL2 proposal and what was adopted in SQL:2011 is that there are no hidden columns in the SQL:2011 treatment, nor does it have a new data type for intervals; instead two columns with datestamps (DS) or date-timestamps (DTS) can be bound together using a PERIOD FOR declaration. Another difference is ...
These timestamps ensure that transactions affect each object in the same sequence of their respective timestamps. Thus, given two operations that affect the same object from different transactions, the operation of the transaction with the earlier timestamp must execute before the operation of the transaction with the later timestamp.
The period is an interval based on load times (called load datetime in data vault [1] [2]), also called inscription timestamp. [1] Other names of the interval is assertion timeline [3]), state timeline [3]) or technical timeline. [3] SQL:2011 has support for transaction time through so-called system-versioned tables. [4] [5] [6] [7]
New data types defined: DATE, TIME, TIMESTAMP, INTERVAL, BIT string, VARCHAR strings, and NATIONAL CHARACTER strings. Support for additional character sets beyond the base requirement for representing SQL statements. New scalar operations such as string concatenation and substring extraction, date and time mathematics, and conditional statements.
An SQL date-timestamp can still be useful to store in the fact table, as it allows for precise calculations. Having both the date and time of day in the same dimension, may easily result in a huge dimension with millions of rows.