Viewing object DDL structure
The DDL (Data Definition Language) tab displays the SQL statement for creating the object with all its subobjects, if any. This text is read-only. If you want to change the object definition, use the appropriate editor tabs instead, or copy the text to the Windows Clipboard to paste it in the SQL Editor or SQL Script Editor.
Hint: If more convenient, you can use the Save DDL to file and Open DDL in SQL Editor items available on the DDL pane within the Navigation bar of object editors.