If the provided table and column exists within the user's schema's table based User Interface Defaults, the UI Defaults for it are deleted.
Syntax
APEX_UI_DEFAULT_UPDATE.DEL_COLUMN (
    p_table_name            IN VARCHAR2,
    p_column_name           IN VARCHAR2);
Parameters
Table 27-5 DEL_COLUMN Parameters
| Parameter | Description | 
|---|---|
| 
 
  | 
 Name of table whose column's UI Defaults are to be deleted.  | 
| 
 
  | 
 Name of columns whose UI Defaults are to be deleted.  | 
Example
The following example deletes the column CREATED_BY from the EMP table definition within the UI Defaults Table Dictionary within the current schema.
BEGIN
    apex_ui_default_update.del_column (
       p_table_name  => 'EMP',
       p_column_name => 'CREATED_BY' );
END;