DatabaseSpy's Design Editor provides various options to create or change the design of a table.
•Select a table, column, or primary key in the Online Browser or in a table design and drop it onto a table design of another table.
•Select a column in a table design and drop it onto the keys or index section of the same table
To display a context menu with various commands that let you modify the database structure, right-click any of the following parts of Design Editor:
•The table header, or any of the Keys, Indexes, or Constraints sections
Each section in a table design provides a Create New Object button for adding new database objects to a table. Clicking this button will immediately add a new column or check constraint, or pop up a menu where you can choose the type of key or index you want to define.
The command for adding new columns is also available in the Design Editor menu. Select the menu option Design Editor | Create New Column to add a new column to the active table design in the Design Editor.
DatabaseSpy provides also the keyboard shortcut Alt+C for adding new columns in the Design Editor.
In addition to using Design Editor, you can always write and execute SQL statements in SQL Editor to achieve the same goal.