On 3 Jan 2013, at 5:29pm, Quanren Xiong <qxi...@amcomsoft.com> wrote:

> Just curious. Do you know how the Visual Studio Designer works?
> In designer, the Null value is converted to 0. 

In SQL null is not 0.  'null' means 'value missing' or 'value unknown'.  It is 
closer to NaN = NotANumber.

Simon.
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