Fazendo exatamente o que vc falou...
sqlite> select * from fatura;
1|2|1|1|1|30/08/2012|01/08/2012|EXTENSO|3040.51|1
2|2|1|1|1|30/08/2012|01/08/2012|EXTENSO|3040.51|1
3|2|1|1|1|30/08/2012|03/08/2012|EXTENSO|3040.51|1
4|2|1|1|1|30/08/2012|03/08/2012|EXTENSO|3040.51|1
5|2|1|1|1|30/08/2012|01/08/2012|EXTENSO|3040.51|1
sqlite> select emiss,count(*) from fatura group by emiss order by emiss;
01/08/2012|3
03/08/2012|2
sqlite>