Example: Making Composite Changes to a Column: NOT NULL to NULL - Advanced SQL Engine - Teradata Database

SQL Data Definition Language Syntax and Examples

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Published
January 2021
Language
English (United States)
Last Update
2021-01-22
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B035-1144
lifecycle
previous
Product Category
Teradata Vantage™

Composite changes to columns that involve changing the NOT NULL attribute to NULL are not valid. For example, the following cannot be done:

     ALTER TABLE abc ADD column_2 TITLE 'newname' NULL;

To make these changes, you must perform two separate ALTER TABLE requests:

     ALTER TABLE abc ADD column_2 TITLE 'newname';
     ALTER TABLE abc ADD column_2 NULL;