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Prabitha SPrabitha S 

please tell Syntax for upsert & undelete trigger & Purpose undelete?

SonamSonam (Salesforce Developers) 
Following thread has a code snippet for the undelete trigger with the use case defined as well which will help you understand the purpose of undelete:
https://developer.salesforce.com/forums/ForumsMain?id=906F00000008wWXIAY