The given expression could be interpreted as a timestamp.
Try casting it explicitly to date:
... WHERE implantdate!='0001-01-01'::date ...
but that's just a guess.
HTH
Michal Lijowski wrote:
> RabStudies=> SELECT RabNo, ImplantDate, Comments FROM RabStudiesInfo
> where implantdate <> 0001-01-01;
>
> and I get
>
> rabno | implantdate | comments
>
> 307 | 2004-02-23 | No mimetic No target
> 309 | 2004-02-23 | No mimetic No target; Frame 12 study terminated
> 314 | 2004-02-27 | No mimetic No target
> 311 | 2004-02-27 | No mimetic No target
> 310 | 2004-02-26 | No mimetic No target No decoy
> 315 | 0001-01-01 | No Tumor
> 320 | 0001-01-01 | No Tumor
> 316 | 0001-01-01 | No Tumor
> 313 | 0001-01-01 | No Tumor
>
> Why entries with implandate are listed?
> It is the same when I use != instead of <>.
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