insert contacts into database but does not want to duplicate already existing contact

Question

I am trying to insert contacts into database but does not want to duplicate already existing contact.

Not sure INSERT has WHERE CLAUSE.

Any ideas?

Answer 1

Another option is:

//Insert INTO contact database
$user_id = userid;
$sql_insert = "INSERT into `jt_members_external_contacts`
                            (`j_user_id`,`contact_email`,`firstname`)
               SELECT       '$user_id','$email','$name'
                FROM        `jt_members_external_contacts`
               WHERE        j_user_id !=$user_id AND contact_email != $email;";