SQL Server CSV Import: Why Am I Getting Truncation Errors Even with varchar(MAX)?

Truncation Errors in SQL Server CSV Import: Data Type Mismatch

When importing a large CSV file into SQL Server, truncation errors can occur despite specifying varchar(MAX) for each column. This issue stems from the mismatch between the data types used in the Import and Export Wizard and those in SQL Server.

To resolve this error:

1. Open the SQL Server Import and Export Wizard: Launch the wizard to import the CSV file.
2. Configure the Advanced Settings: In the Advanced tab of the Data Source selection page, locate the offending columns with truncation errors.
3. Change the Source Data Type: For each offending column, change the source data type from "DT_STR" (VARCHAR(255)) to "DT_TEXT" (VARCHAR(MAX)).
4. Import the CSV File: Once the data types are corrected, proceed with the import process.

Note:

• You can select multiple columns simultaneously to change their data types in the Advanced tab.
• The screenshot provided (https://i.sstatic.net/KVQdv.jpg) shows the correct data type settings for handling VARCHAR(MAX) columns in the Import and Export Wizard.

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