Why Am I Getting Truncation Errors Importing CSV Files into SQL Server Even with varchar(MAX)?

Truncation Errors Importing CSV Despite varchar(MAX) in SQL Server

In SQL Server, attempts to import a large CSV file using the Import Wizard may encounter truncation errors, even when varchar(MAX) is specified for each column. This is due to differences in data types between the wizard and SQL Server.

Solution:

The Import Wizard allows adjusting data types for the source data in the Advanced tab. To resolve truncation issues, follow these steps:

1. Open the Advanced tab of the Data Source selection.
2. For columns with truncation errors, change the data type from DT_STR to DT_TEXT.
3. Click OK to apply the changes.

Explanation:

• DT_STR: Corresponds to VARCHAR(255) in SQL Server, with a maximum width of 255 characters.
• DT_TEXT: Corresponds to VARCHAR(MAX) in SQL Server, allowing for unlimited text length.

By changing the data type to DT_TEXT, any columns containing truncated data will be imported successfully with their full text.

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