---
title: "ALTER TABLE Statement | Microsoft Docs"
ms.custom: ""
ms.date: "01/19/2017"
ms.prod: sql
ms.prod_service: connectivity
ms.reviewer: ""
ms.technology: connectivity
ms.topic: conceptual
helpviewer_keywords: 
  - "SQL grammar [ODBC], ALTER TABLE"
  - "ALTER TABLE [ODBC]"
ms.assetid: 9cfa6ea3-7e33-46c7-99fd-3c717fbcc4e6
author: David-Engel
ms.author: v-daenge
---
# ALTER TABLE Statement
When the Microsoft Access, dBASE, or Paradoxdriver is used, the ALTER TABLE statement is supported with add and drop table constraint definition clauses. (ALTER TABLE statements are not supported for the Microsoft Excel or Text drivers.)  
  
> [!NOTE]  
>  When you use the Paradox driver without implementing the Borland Database Engine, ALTER TABLE statements are not supported; only read and append statements are allowed.