There are "AlterTable" command in dbx metadata?

How do I use the dbx metadata to modify an existing database? I'm trying, but I just able to create a new tables, with the new columns, new definitions... For example, can I add a new column into an existing database?

The "C开发者_如何学JAVAreateTable" command dont makes changes... i'm right? There are "AlterTable" command or something like this?

I'm using Delphi XE with Firebird

Thanks

---

Use SQL commands directly, then you can do anything that your database supports. No need to have DBX interfering with that process.