SQL Server ntext、text 和 image
在 MicrosoftSQL Server 的未来版本中将删除 ntext、text 和 image 数据类型。请避免在新开发工作中使用这些数据类型，并考虑修改当前使用这些数据类型的应用程序。请改用 nvarchar(max)、varchar(max) 和 varbinary(max)。
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