Trasformer requete sql en soql

Bonjour,
je souhaite transformer cette requête sql:

Code:

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Select u.Userame, cg.Name, cg.LastModifiedDate From CollaborationGroup cg, User u Where u.Id = cg.OwnerID AND cg.LastModifiedDate < 2013-04-20T14:00:00.000Z

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en requête SOQL Salesforce
Merci.

Code:

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SELECT Owner.Username, LastFeedModifiedDate, Name, OwnerId FROM CollaborationGroup WHERE LastModifiedDate < LAST_N_DAYS:90

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