16.20 - Data Type, Column Storage, and Constraint Attributes - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
March 2019
Content Type
Programming Reference
Publication ID
B035-1184-162K
Language
English (United States)

Column storage attributes are a Teradata extension to ANSI SQL. If you do not specify explicit formatting, a column assumes the default format for the data type, which can be specified by a custom data formatting specification (SDF) defined by the tdlocaledef utility. For more information, see Teradata Vantage™ - Database Utilities , B035-1102 . Explicit formatting applies to the parsing and to the retrieval of character strings.

If you change the tdlocaledef.txt file and issue a tpareset command, the new format string settings affect only those tables that are created after the reset. Existing table columns continue to use the existing format string in DBC.TVFields unless you submit an ALTER TABLE statement to change it. For more information, see ALTER TABLE (Basic Table Parameters).

Not all data type attributes are supported for UDT, ARRAY, VARRAY, Geospatial, and Period column declarations, and no column storage or column constraint attributes are supported for those types.

You can specify server character sets for character data by specifying CHARACTER SET server_character_set for character columns.

Teradata Database supports the following server character sets.
  • LATIN
  • UNICODE
  • KANJISJIS
  • GRAPHIC

You cannot specify the server character set KANJI1.

Teradata Database automatically converts any existing character columns with a server character set of Kanji1 to a server character set of Unicode.