How to update text field varchar length at synapse SQL database

Hi Anonymous ,

If you are using PolyBase external tables to load your Synapse SQL tables, the defined length of the table row cannot exceed 1 MB. When a row with variable-length data exceeds 1 MB, you can load the row with BCP, but not with PolyBase.

• Avoid defining character columns with a large default length. For example, if the longest value is 25 characters, then define your column as VARCHAR(25).
• Avoid using [NVARCHAR][NVARCHAR] when you only need VARCHAR.
• When possible, use NVARCHAR(4000) or VARCHAR(8000) instead of NVARCHAR(MAX) or VARCHAR(MAX).
• Avoid using floats and decimals with 0 (zero) scale. These should be TINYINT, SMALLINT, INT or BIGINT.

More details : Table data types in Synapse SQL - Azure Synapse Analytics | Microsoft Docs

If I have misunderstood you meaning, please provide more details.

Best Regards

Community Support Team _ Polly

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