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# Ingres Alter Table

The Ingres Alter Table Tool allows users to visually alter tables. The Alter Table Tool can generate and/or execute the SQL that corresponds to any table alterations specified by the user.

The following options are available for the Ingres Alter Table Tool.

Add Column - Adds a column to a table
Add Primary Key - Adds a primary key to a table
Add Foreign Key - Adds a foreign key to a table
Add Constraint - Adds a check constraint to a table
Drop Column - Drops a column from a table
Drop Constraint - Drops a check constraint from a table

Listed below are some sample SQL statements generated by the Alter Table Tool.

ALTER TABLE administrator.airline ADD new_col char(25)
ALTER TABLE administrator.airline ADD PRIMARY KEY (al_id)