Trigger-4

When we Create a new record on Account Object with different Names if name is existed in the Account object it show an error on Account Name.

trigger Trigger4 on Account (before insert) {
    for(Account a:Trigger.New){
        List<Account> accs=[select id, Name From Account Where Name=:a.Name];
        if(accs.size()<0){
            a.Name.addError('Sorry Account alredy exits');
        }
    }
}
// If you want to create a new record with existing record name, system show an Error message