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SQL Statements and Extensions for the Salesforce Driver : Alter Table : Altering a Remote Table : Drop Clause: Columns
  
Drop Clause: Columns
Purpose
Use the Drop clause to drop a column from an existing table. It is optional.
Syntax
DROP {[COLUMN] column_name | [CONSTRAINT] constraint_name}
where:
column_name
specifies an existing column in an existing table.
Notes
*The column being dropped cannot have a constraint defined on it.
*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