The Paradox driver supports the Alter Table statement to add one or more columns to a Paradox database file or to delete (drop) a single column.
filename is the name of the Paradox database file to which you are adding or dropping columns.
column_name assigns a name to the column you are adding or specifies the column you are dropping.
data_type specifies the native data type of each column you add.
When dropping a column, use the Cascade keyword to drop the column while removing references from any dependent objects, such as indexes or views. Use Restrict to cause the Alter Table statement to fail if other objects are dependent upon the column you are dropping. For example, to drop a column and remove its references from dependent objects:
If the Alter Table statement contains neither Cascade nor Restrict, it fails when you attempt to drop a column upon which other objects are dependent.