>Em 29 de novembro de 2011 20:17, Moisés P. Sena <[email protected]> 
>escreveu:
................
>
>               data           | mem
> -------------------------------+------
>  2011-11-21 15:21:00 | 1038
>  2011-11-21 15:22:00 | 1049 *
>
>  2011-11-21 15:25:00 | 1052
>  2011-11-21 15:26:00 | 1054 *
>
>  2011-11-21 15:29:00 | 1065
>  2011-11-21 15:30:00 | 1080 *
>
>  2011-11-21 15:32:00 | 1073
>  2011-11-21 15:33:00 | 1065
>  2011-11-21 15:34:00 | 1049 **
>
.............................

Acho que uma coisa bem simples pode resolver:

select min(data) as 'data', mem
from tabela
group by mem
order by 1;

-- 
Marcone Peres - DBA
http://www.linkedin.com/in/marconeperes
@marconeperes
(61) 8146-0028
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