trigger PreventAccountduplicacy on Account (before insert, before update) {
map<Id,Account> existingAccountMap = new map<Id,Account>([Select Id, Name From Account]);
for(Account a : Trigger.new){
if(a.name == existingAccountMap.get(a.Id).Name){
a.adderror('dulplicate account'+a);
}
}
}
map<Id,Account> existingAccountMap = new map<Id,Account>([Select Id, Name From Account]);
for(Account a : Trigger.new){
if(a.name == existingAccountMap.get(a.Id).Name){
a.adderror('dulplicate account'+a);
}
}
}
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