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Meena SambathMeena Sambath 

String records ='Select id,Approval_Matrix__C,Approval_Routing_Note__c from Approval__C where Approval_Matrix__C=null';

  String  records ='Select id,Approval_Matrix__C,Approval_Routing_Note__c from Approval__C where Approval_Matrix__C=null';
I am able to query these fields Approval_Matrix__C( Ready Only)   , Approval_Routing_Note__c (Editable) in Query Editor these fields have some data but i am not able to query in in code.
bharath kuppalabharath kuppala
Meena Try this 
List <Approval__C > records = [Select id,Approval_Matrix__C,Approval_Routing_Note__c from Approval__C where Approval_Matrix__C=null];
Raj VakatiRaj Vakati
You need to check Not NULL i guess  like below 

  String  records ='Select id,Approval_Matrix__C,Approval_Routing_Note__c from Approval__C where Approval_Matrix__C!=null';