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並前往https://www.toolbox.com/tech/data-management/question/difference-betwn-null-and-null-in-default-value-for-dml-050207/

Difference betwn. NULL and NULL(”) in default value for DML

Null means that if a NULL value is written to the DML (in transform ... the default it won't apply because the input component is not a transform component.

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