taking combination of row where costs are higher

Hi,

i have scenario like:

customer  - country - Month - Cost

001             IN          01          -100

001             US         01          -200

001             IN          02          -50

001             CN         02         -100   

result should be:

customer  - country - Month - Cost

001             US         01          -200

001             CN         02         -100

means taking the combination where cost is higher for each customer over each month. Is this something possible with graphical calc view? or have to do SQL script?

best regards

Ahmad'