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Neha Sameen 1Neha Sameen 1 

Combination of 3 field to make it unique in apex code

How to combine 3 map type field in apex.. then with the unique combination. i have to send mail also. Please help
Can you please elaborate what is it you want to do exactly ?
Neha Sameen 1Neha Sameen 1
I have one custom object (say ABC__c) and it has 3 custom fields of a map type.. Field1__c, field2__c and field3_c. Now I want to make one field (say field4__c) which will contain unique combination of all the 3 fields.