out of BOL 2005...
If an ntext, text, and image data value is no longer than a Unicode, 4,000 characters; character, 8,000 characters; or binary string, 8,000 bytes, the value can be referenced in SELECT, UPDATE, and INSERT statements much the same way as the smaller data types. For example, an ntext column with a short value can be referenced in a SELECT statement select list the same way an nvarchar column is referenced. Some restrictions that must be observed, such as not being able to directly reference an ntext, text, or image column in a WHERE clause. These columns can be included in a WHERE clause as parameters of a function that returns another data type, such as ISNULL, SUBSTRING or PATINDEX, or in an IS NULL, IS NOT NULL, or LIKE expression.
hope this helps,
derek
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