Adds a column, removes a column, or redefines a column in a table. The table being altered can be either a remote or local table. A remote table is a Salesforce object and is exposed in the SFORCE schema. A local table is maintained by the driver and is local to the machine on which the driver is running. A local table is exposed in the PUBLIC schema.
Syntax
ALTER TABLE table_name [add_clause] [drop_clause] [rename_clause]