![]() The worst thing is that the import is finished “successfully” without any error or warning about the truncated strings. Even if you change the mapping type in the import wizard to be nvarchar(max) it will ignore it and won’t fix the problem. If there are no strings longer than 256 characters in a particular column in the first 8 rows SQL will consider it as nvarchar(255) and will truncate all the cells of that column to 256 character. SQL checks the first 8 rows to make assumption for the data types. When checking the resulting table all long string are truncated to 256 characters even though the field type is nvarchar(max). ![]() Import is executed and finished without errors. In the wizard the data types mapping is set to nvarchar(max) so the strings longer than 256 chars are imported without being truncated. ![]() There is an Excel sheet which should be imported to SQL table using SQL Server import data wizard. Value of some Excel cells which contain long strings are truncated to 256 characters when importing an Excel sheet to SQL Server.
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