嗨Soumitra，

Hi Soumitra,

Polybase会将NULL字符串视为NULL值.您有两种选择:

Polybase is going to treat NULL string as NULL value. You have a couple options:

您可以将列定义更改为接受NULL值吗.

Can you change your column definition to accept NULL values.

或者您可以利用Azure Data Factory中的Polybase在加载时执行其他步骤来控制/清理数据:

Or you can leverage Polybase within Azure Data Factory to perform additional steps at load time to control/scrub the data: Copy data to or from Azure SQL Data Warehouse by using Azure Data Factory

我&nbsp ;希望有帮助！

I hope this helps!

此致

迈克