以下のクエリはレコードを一切返しません:
"[SELECT Id FROM Account WHERE Id = :Trigger.new[0].Account__c]"
クエリがレコードを返さない場合、「List has no rows for assignment to SObject」というエラーが発生します。
Player__c player = [SELECT Id from Player__c where Name = :username]; if (player != null) p = player.Id;
Player__c[] players = [SELECT Id from Player__c where Name = :username]; if (players.size() > 0) p = players[0].Id;
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