Hi Team Pls Help me....

Use Case:update below fields from the Most Recent Event corresponding to a contact with type="Call" to the Contact objects in Salesforce 

Below are the fields which we are going to automate :
1.IsPrivate
2.StartDateTime     
3.Subject

Only Using Trigger......

Req.- On account object, having 2 fields 1st- D1 and 2nd- D2.
While inserting or updating account if D1 != D2 then it will compare the D2 value to D1 values from all org account and if any record found then that account having all contacts assigned to Inserting or updating an account.