17.10 - Usage Notes - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Data Types and Literals

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1143-171K
Language
English (United States)

Storage

A PERIOD(TIME[(n)] WITH TIME ZONE) is a fixed length data type and is saved as two TIME WITH TIME ZONE values.

Element Type Field Size in Bytes Maximum Size in Bytes in the Row
TIME(n) WITH TIME ZONE 16 16

External Representation of PERIOD(TIME WITH TIME ZONE)

In field mode, Vantage returns PERIOD(TIME WITH TIME ZONE) data as character data.

Assume L is the maximum length of the formatted character string for the format associated with this Period data type. The resulting character string contains two strings representing the beginning and ending bounds of the period value expression, each up to length L , and each enclosed in apostrophes ('), separated by comma and a space (,), and then enclosed within a left and right parenthesis [( )]. Thus, the maximum length of the resulting character string is 2* L +8.

For modes other than field mode, and for input data, the external representation of PERIOD(TIME WITH TIME ZONE) consists of two consecutive time with time zone values. Each time value consists of multiple fields as explained below and returned in the specified order:
  • Second: 4-byte, signed integer flipped to client form. This integer represents the number of seconds as a scaled decimal (for example, 12.56 seconds is returned as 12560000).
  • Hour: 1 unsigned byte. This byte represents the number of hours.
  • Minute: 1 unsigned byte. This byte represents the number of minutes.
  • Time Zone Hour: 1 unsigned byte. This byte represents the hours portion of the time zone displacement along with whether the displacement is + or -. A value of 16 represents 0 hours. A value less than 16 represents a negative time zone displacement for the specified hours; that is, if this is 10, the time zone is displaced by -10 hours. If greater than 16, it specifies a positive time zone displacement of (Time Zone Hour - 16) hours; that is, a value of 20 implies a +4 hour displacement.
  • Time Zone Minute: 1 unsigned byte. This byte represents the minute's portion of the time zone displacement.

Restrictions

A primary index column or partitioning column cannot be a column that has a Period data type.