Summary SQL deadlock investigation

select dbname,entity_name,count(1) as locks from 
(SELECT request_session_id AS spid,  
       DB_NAME(resource_database_id) AS dbname,  
       CASE WHEN resource_type='object'   
                 THEN OBJECT_NAME(resource_associated_entity_id)   
            WHEN resource_associated_entity_id=0 THEN 'n/a'  
            ELSE OBJECT_NAME(p.object_id) END AS entity_name,  
       index_id,  
       resource_type AS RESOURCE,  
       resource_description AS DESCRIPTION,  
       request_mode AS mode,  
       request_status AS STATUS   
FROM sys.dm_tran_locks t LEFT JOIN sys.partitions p ON p.partition_id=t.resource_associated_entity_id  
WHERE resource_database_id=DB_ID()) as a group by a.dbname,a.entity_name