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Reference : Supported SQL Statements and Extensions : Alter Table : Drop Clause: Columns
  

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Drop Clause: Columns

Purpose

Use the Drop clause to drop a column from an existing table. It is optional.

Syntax

DROP {[COLUMN] column_name}
where:
column_name
specifies an existing column in an existing table.

Notes

*Drop fails if a SQL view includes the column.

Example A

This example drops the status column. For the operation to succeed, the status column cannot have a constraint defined on it and cannot be used in a SQL view.
ALTER TABLE test DROP COLUMN status