function readOnly(count){ }
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1. https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers.htm
2. https://developer.salesforce.com/page/Trigger_Frameworks_and_Apex_Trigger_Best_Practices
3. https://www.salesforce.com/us/developer/docs/apexcode/Content/apex_triggers_context_variables.htm
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Refer the following links that are helpful for u.
http://www.sfdc99.com/2013/05/09/what-is-a-salesforce-trigger/
https://help.salesforce.com/HTViewHelpDoc?id=code_define_trigger.htm&language=en_US