Use nvarchar(max) for ntext in MS SQL 2005 and later versions

Error:
The ntext data type cannot be selected as DISTINCT because it is not comparable

Prob: Union fails, If a table contains nText datatype field

Answer: Use nVarChar(MAX)(This works only SQL 2005 and Above versions)

Similarly, use VarChar(MAX) for TEXT, varbinary(max) for image