First, thanks a lot for your response...
(No problem with "DATE", I have given this name for the example but the real name is different.)
This solution is interesting but it doesn't correspond exactly to my problem.
But I have forgottent something in my example. Here is the correct example ...
Here is a sample of my database :
DATE | OPERATOR
----------------------
2004-08-01 | ope1
2004-08-01 | ope3
2004-08-03 | ope2
2004-08-03 | ope1
2004-08-03 | ope3
2004-08-07 | ope2
2004-08-10 | ope3
("Operator" is an enum of 'ope1', 'ope2', 'ope3')
And I want to obtain something like...
Hello everybody !
I don't know how to count different values from a column. I axplain myself :
Here is my DB :
(PLACE & PEOPLE are strings, GAME is a SET of (game1, game2, game3)
PLACE PEOPLE GAME
Tokyo Mr A game1
Tokyo Mr B game1
N-Y Mr C game2
Paris Mr D...
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