SELECT NodeName
FROM sys.dm_os_cluster_nodes

SELECT SERVERPROPERTY('IsClustered')

select serverproperty ('IsHadrEnabled')

SELECT
   AGC.name -- Availability Group
 , RCS.replica_server_name -- SQL cluster node name
 , ARS.role_desc  -- Replica Role
 , AGL.dns_name  -- Listener Name
FROM
 sys.availability_groups_cluster AS AGC
  INNER JOIN sys.dm_hadr_availability_replica_cluster_states AS RCS
   ON
    RCS.group_id = AGC.group_id
  INNER JOIN sys.dm_hadr_availability_replica_states AS ARS
   ON
    ARS.replica_id = RCS.replica_id
  INNER JOIN sys.availability_group_listeners AS AGL
   ON
    AGL.group_id = ARS.group_id
WHERE
 ARS.role_desc = 'PRIMARY'