On May 12, 2011, at 11:44 AM, naneon.raym...@neuf.fr wrote:

> 
> My problem is this fetch don't use *disctinct* and I have several time the 
> same student. 

Simple?

fetchEtudiantViaUvDg.setUsesDistinct(true);

See:
http://developer.apple.com/legacy/mac/library/documentation/InternetWeb/Reference/WO542Reference/com/webobjects/eocontrol/EOFetchSpecification.html#setUsesDistinct(boolean)

Henrique Gomes

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