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Roll up summary using trigger

Hi 
I am newbie

I have custom object let say Object1 having self relationship(Lookup) and custom field cost
I want to roll up summary field let say Sum on object1 using trigger
Please help.
RbnRbn
Hi SSS,

Please go through the link which will help you to get to your requirement.

http://blog.jeffdouglas.com/2009/07/30/roll-up-summary-fields-with-lookup-relationships-part-1/

Let me know if you want any further help on this.

Regards,
Rabi