15.00 - Dropping Columns from a Normalized Table - Teradata Database

Teradata Database SQL Data Definition Language Detailed Topics

Teradata Database
Release Number
Content Type
Programming Reference
Publication ID
English (United States)

Dropping Columns from a Normalized Table

The following rules and restrictions apply to dropping columns from a normalized table.

  • You can drop any column from a normalized table, including ignore columns.
  • Dropping a normalized Period column also drops the NORMALIZE clause from the table definition.
  • Teradata Database renormalizes a normalized table if you drop a column that is not specified in the ignore column list from the table or when a column is added to the ignore column list.
  • You can use an ALTER TABLE request to alter the normalize_ignore_columns column list by specifying the DROP NORMALIZE option. This include the complete list - normalize clause and the ignore columns.
  • You cannot add and drop normalization from a table within the same ALTER TABLE request.
  • For information about adding columns to a normalized table, see “Adding Columns to a Normalized Table” on page 55.