Check for duplicate Leads & Contact using Trigger

Kapil April 06, 2020

How to check for duplicate Leads if a Contact already exist with the same Email ?


Hello folks, in this post you will learn to create a trigger on Lead to check for duplicate records if a Contact is already exist with same email address. 

Please follow below code : 


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trigger CheckDuplicateLeads on Lead (before insert, before update) {
    for (Lead myLead : Trigger.new) {
        //Check if the email is not null
        if (myLead.Email != null) {
            //Get list of contact with the same email we have used in Lead
            List<Contact> con = [SELECT Id FROM Contact WHERE Email = :myLead.Email];
            //Check if the list is not empty
            if (con.size() > 0) {
                //Action if duplicate
            } else {
                //Action if Unique
            }                             
        }
    }
}




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