Thank you ksug,
Your indication makes sense.

I try to check more detail.
And I'll feedback.

2016年9月28日水曜日 22時58分24秒 UTC+9 ksug:
>
> I don't think placeholder vs no placeholder makes a difference. Here is 
> an example where Scan() into the same table could return values of 
> different types (using sqlite instead of mysql). 
>
> https://play.golang.org/p/rAA04pv_I_ 
>
> I'm not saying that this is what's definitely happening on your end, 
> just that it's possible. 
> Look at: 
> - implicit type conversions 
> - database, driver behavior 
> - driver bug 
> - etc 
>
> As I said, more information is needed. 
>

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