Why Do I Get Truncation Errors Importing CSV Data into SQL Server's varchar(MAX) Columns?

Resolving Truncation Errors During SQL Server CSV Import with varchar(MAX) Column Types

When attempting to import a large CSV file into SQL Server, it's possible to encounter truncation errors, even when using the varchar(MAX) data type for each column. This issue stems from inconsistencies in data type handling between the SQL Server Import and Export Wizard and the actual SQL Server data types.

Solution:

Within the SQL Server Import and Export Wizard, navigate to the Advanced tab on the Data Source selection. Here, adjust the source data types to match the desired data types in the target table. Specifically:

• For varchar(MAX) columns, change the data type from DT_STR to DT_TEXT.

By selecting multiple offending columns, you can modify their data types simultaneously.

Example:

Suppose you encounter the following error during import:

Data conversion failed. The data conversion for column "

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