Essayez d'utiliser DISTINCT comme ceci :
SELECT DISTINCT mycolumn FROM mytable
MODIF :
Essayez
select mycolumn, count(mycolumn) c from mytable
group by mycolumn having c = 1
Essayez d'utiliser DISTINCT comme ceci :
SELECT DISTINCT mycolumn FROM mytable
MODIF :
Essayez
select mycolumn, count(mycolumn) c from mytable
group by mycolumn having c = 1