17.00 - compression_attributes - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
Release Date
September 2020
Content Type
Programming Reference
Publication ID
B035-1144-170K
Language
English (United States)

These attributes are Teradata extensions to the ANSI SQL:2011 specification.

COMPRESS
A specified set of distinct values in a column that is to be compressed to zero space.
See Teradata Vantage™ - Database Design, B035-1094 for a detailed description of multivalue compression.
See Teradata Vantage™ - Data Types and Literals, B035-1143 for more information about the COMPRESS attribute.
constant
Specifies that nulls and the value are compressed.
Compressed constants are typically string literal. For numeric columns, constants have a numeric data type.
The most space a numeric value can occupy is eight bytes.
Using COMPRESS on fixed-length character data can save space depending on the percentage of rows for which the compressed value is assigned.
See Teradata Vantage™ - Data Types and Literals, B035-1143 for information about limits for this value.
NULL
Specifies that nulls are compressed.
You can only specify NULL once per column.